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CesiumGltfComponent.cpp
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CesiumGltfComponent.cpp
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// Copyright 2020-2021 CesiumGS, Inc. and Contributors
#include "CesiumGltfComponent.h"
#include "Async/Async.h"
#include "Cesium3DTilesSelection/GltfUtilities.h"
#include "Cesium3DTilesSelection/RasterOverlay.h"
#include "Cesium3DTilesSelection/RasterOverlayTile.h"
#include "CesiumCommon.h"
#include "CesiumEncodedMetadataUtility.h"
#include "CesiumFeatureIdAttribute.h"
#include "CesiumFeatureIdTexture.h"
#include "CesiumFeatureTable.h"
#include "CesiumFeatureTexture.h"
#include "CesiumFeatureTextureProperty.h"
#include "CesiumGeometry/Axis.h"
#include "CesiumGeometry/Rectangle.h"
#include "CesiumGeometry/Transforms.h"
#include "CesiumGltf/AccessorView.h"
#include "CesiumGltf/ExtensionKhrMaterialsUnlit.h"
#include "CesiumGltf/ExtensionMeshPrimitiveExtFeatureMetadata.h"
#include "CesiumGltf/ExtensionModelExtFeatureMetadata.h"
#include "CesiumGltf/PropertyType.h"
#include "CesiumGltf/TextureInfo.h"
#include "CesiumGltfPointsComponent.h"
#include "CesiumGltfPrimitiveComponent.h"
#include "CesiumMaterialUserData.h"
#include "CesiumRasterOverlays.h"
#include "CesiumRuntime.h"
#include "CesiumTextureUtility.h"
#include "CesiumTransforms.h"
#include "CesiumUtility/Tracing.h"
#include "CesiumUtility/joinToString.h"
#include "Chaos/AABBTree.h"
#include "Chaos/CollisionConvexMesh.h"
#include "Chaos/TriangleMeshImplicitObject.h"
#include "CreateGltfOptions.h"
#include "Engine/CollisionProfile.h"
#include "Engine/StaticMesh.h"
#include "HttpModule.h"
#include "Interfaces/IHttpResponse.h"
#include "LoadGltfResult.h"
#include "Materials/Material.h"
#include "Materials/MaterialInstanceDynamic.h"
#include "MeshTypes.h"
#include "PhysicsEngine/BodySetup.h"
#include "PhysicsEngine/PhysicsSettings.h"
#include "PixelFormat.h"
#include "Runtime/Launch/Resources/Version.h"
#include "StaticMeshOperations.h"
#include "StaticMeshResources.h"
#include "UObject/ConstructorHelpers.h"
#include "VecMath.h"
#include "mikktspace.h"
#include <cstddef>
#include <glm/ext/matrix_transform.hpp>
#include <glm/gtc/matrix_inverse.hpp>
#include <glm/gtc/quaternion.hpp>
#include <glm/mat3x3.hpp>
#include <iostream>
#if WITH_EDITOR
#include "ScopedTransaction.h"
#endif
using namespace CesiumGltf;
using namespace CesiumTextureUtility;
using namespace CesiumEncodedMetadataUtility;
using namespace CreateGltfOptions;
using namespace LoadGltfResult;
namespace {
// UE4 and UE5 both use single-precision vectors for meshes, but they have
// different names.
#if ENGINE_MAJOR_VERSION == 5
using TMeshVector2 = FVector2f;
using TMeshVector3 = FVector3f;
using TMeshVector4 = FVector4f;
#else
using TMeshVector2 = FVector2D;
using TMeshVector3 = FVector;
using TMeshVector4 = FVector4;
#endif
} // namespace
static uint32_t nextMaterialId = 0;
namespace {
void destroyHalfLoadedTexture(
TUniquePtr<CesiumTextureUtility::LoadedTextureResult>& pHalfLoadedTexture) {
if (pHalfLoadedTexture) {
CesiumTextureUtility::destroyHalfLoadedTexture(*pHalfLoadedTexture.Get());
}
}
class HalfConstructedReal : public UCesiumGltfComponent::HalfConstructed {
public:
LoadModelResult loadModelResult{};
virtual ~HalfConstructedReal() {
// TODO: deal with metadata case, when metadata uses async texture creation
// path See: https://github.com/CesiumGS/cesium-unreal/issues/979
for (LoadNodeResult& node : loadModelResult.nodeResults) {
if (node.meshResult) {
for (LoadPrimitiveResult& primitive :
node.meshResult->primitiveResults) {
destroyHalfLoadedTexture(primitive.baseColorTexture);
destroyHalfLoadedTexture(primitive.metallicRoughnessTexture);
destroyHalfLoadedTexture(primitive.normalTexture);
destroyHalfLoadedTexture(primitive.emissiveTexture);
destroyHalfLoadedTexture(primitive.occlusionTexture);
destroyHalfLoadedTexture(primitive.waterMaskTexture);
}
}
}
}
};
} // namespace
template <class... T> struct IsAccessorView;
template <class T> struct IsAccessorView<T> : std::false_type {};
template <class T> struct IsAccessorView<AccessorView<T>> : std::true_type {};
template <class T>
static uint32_t updateTextureCoordinates(
const Model& model,
const MeshPrimitive& primitive,
bool duplicateVertices,
TArray<FStaticMeshBuildVertex>& vertices,
const TArray<uint32>& indices,
const std::optional<T>& texture,
std::unordered_map<uint32_t, uint32_t>& textureCoordinateMap) {
if (!texture) {
return 0;
}
return updateTextureCoordinates(
model,
primitive,
duplicateVertices,
vertices,
indices,
"TEXCOORD_" + std::to_string(texture.value().texCoord),
textureCoordinateMap);
}
uint32_t updateTextureCoordinates(
const Model& model,
const MeshPrimitive& primitive,
bool duplicateVertices,
TArray<FStaticMeshBuildVertex>& vertices,
const TArray<uint32>& indices,
const std::string& attributeName,
std::unordered_map<uint32_t, uint32_t>& textureCoordinateMap) {
auto uvAccessorIt = primitive.attributes.find(attributeName);
if (uvAccessorIt == primitive.attributes.end()) {
// Texture not used, texture coordinates don't matter.
return 0;
}
int uvAccessorID = uvAccessorIt->second;
auto mapIt = textureCoordinateMap.find(uvAccessorID);
if (mapIt != textureCoordinateMap.end()) {
// Texture coordinates for this accessor are already populated.
return mapIt->second;
}
size_t textureCoordinateIndex = textureCoordinateMap.size();
textureCoordinateMap[uvAccessorID] = textureCoordinateIndex;
AccessorView<TMeshVector2> uvAccessor(model, uvAccessorID);
if (uvAccessor.status() != AccessorViewStatus::Valid) {
return 0;
}
if (duplicateVertices) {
for (int i = 0; i < indices.Num(); ++i) {
FStaticMeshBuildVertex& vertex = vertices[i];
uint32 vertexIndex = indices[i];
if (vertexIndex >= 0 && vertexIndex < uvAccessor.size()) {
vertex.UVs[textureCoordinateIndex] = uvAccessor[vertexIndex];
} else {
vertex.UVs[textureCoordinateIndex] = TMeshVector2(0.0f, 0.0f);
}
}
} else {
for (int i = 0; i < vertices.Num(); ++i) {
FStaticMeshBuildVertex& vertex = vertices[i];
if (i >= 0 && i < uvAccessor.size()) {
vertex.UVs[textureCoordinateIndex] = uvAccessor[i];
} else {
vertex.UVs[textureCoordinateIndex] = TMeshVector2(0.0f, 0.0f);
}
}
}
return textureCoordinateIndex;
}
static int mikkGetNumFaces(const SMikkTSpaceContext* Context) {
TArray<FStaticMeshBuildVertex>& vertices =
*reinterpret_cast<TArray<FStaticMeshBuildVertex>*>(Context->m_pUserData);
return vertices.Num() / 3;
}
static int
mikkGetNumVertsOfFace(const SMikkTSpaceContext* Context, const int FaceIdx) {
TArray<FStaticMeshBuildVertex>& vertices =
*reinterpret_cast<TArray<FStaticMeshBuildVertex>*>(Context->m_pUserData);
return FaceIdx < (vertices.Num() / 3) ? 3 : 0;
}
static void mikkGetPosition(
const SMikkTSpaceContext* Context,
float Position[3],
const int FaceIdx,
const int VertIdx) {
TArray<FStaticMeshBuildVertex>& vertices =
*reinterpret_cast<TArray<FStaticMeshBuildVertex>*>(Context->m_pUserData);
const TMeshVector3& position = vertices[FaceIdx * 3 + VertIdx].Position;
Position[0] = position.X;
Position[1] = -position.Y;
Position[2] = position.Z;
}
static void mikkGetNormal(
const SMikkTSpaceContext* Context,
float Normal[3],
const int FaceIdx,
const int VertIdx) {
TArray<FStaticMeshBuildVertex>& vertices =
*reinterpret_cast<TArray<FStaticMeshBuildVertex>*>(Context->m_pUserData);
const TMeshVector3& normal = vertices[FaceIdx * 3 + VertIdx].TangentZ;
Normal[0] = normal.X;
Normal[1] = -normal.Y;
Normal[2] = normal.Z;
}
static void mikkGetTexCoord(
const SMikkTSpaceContext* Context,
float UV[2],
const int FaceIdx,
const int VertIdx) {
TArray<FStaticMeshBuildVertex>& vertices =
*reinterpret_cast<TArray<FStaticMeshBuildVertex>*>(Context->m_pUserData);
const TMeshVector2& uv = vertices[FaceIdx * 3 + VertIdx].UVs[0];
UV[0] = uv.X;
UV[1] = uv.Y;
}
static void mikkSetTSpaceBasic(
const SMikkTSpaceContext* Context,
const float Tangent[3],
const float BitangentSign,
const int FaceIdx,
const int VertIdx) {
TArray<FStaticMeshBuildVertex>& vertices =
*reinterpret_cast<TArray<FStaticMeshBuildVertex>*>(Context->m_pUserData);
FStaticMeshBuildVertex& vertex = vertices[FaceIdx * 3 + VertIdx];
FVector3f TangentZ = vertex.TangentZ;
TangentZ.Y = -TangentZ.Y;
FVector3f TangentX = TMeshVector3(Tangent[0], Tangent[1], Tangent[2]);
FVector3f TangentY =
BitangentSign * TMeshVector3::CrossProduct(TangentZ, TangentX);
TangentX.Y = -TangentX.Y;
TangentY.Y = -TangentY.Y;
vertex.TangentX = TangentX;
vertex.TangentY = TangentY;
}
static void computeTangentSpace(TArray<FStaticMeshBuildVertex>& vertices) {
SMikkTSpaceInterface MikkTInterface{};
MikkTInterface.m_getNormal = mikkGetNormal;
MikkTInterface.m_getNumFaces = mikkGetNumFaces;
MikkTInterface.m_getNumVerticesOfFace = mikkGetNumVertsOfFace;
MikkTInterface.m_getPosition = mikkGetPosition;
MikkTInterface.m_getTexCoord = mikkGetTexCoord;
MikkTInterface.m_setTSpaceBasic = mikkSetTSpaceBasic;
MikkTInterface.m_setTSpace = nullptr;
SMikkTSpaceContext MikkTContext{};
MikkTContext.m_pInterface = &MikkTInterface;
MikkTContext.m_pUserData = (void*)(&vertices);
// MikkTContext.m_bIgnoreDegenerates = false;
genTangSpaceDefault(&MikkTContext);
}
static void setUniformNormals(
const TArray<uint32_t>& indices,
TArray<FStaticMeshBuildVertex>& vertices,
TMeshVector3 normal) {
for (int i = 0; i < indices.Num(); i++) {
FStaticMeshBuildVertex& v = vertices[i];
v.TangentX = v.TangentY = TMeshVector3(0.0f);
v.TangentZ = normal;
}
}
static void computeFlatNormals(
const TArray<uint32_t>& indices,
TArray<FStaticMeshBuildVertex>& vertices) {
// Compute flat normals
for (int i = 0; i < indices.Num(); i += 3) {
FStaticMeshBuildVertex& v0 = vertices[i];
FStaticMeshBuildVertex& v1 = vertices[i + 1];
FStaticMeshBuildVertex& v2 = vertices[i + 2];
// The Y axis has previously been inverted, so undo that before
// computing the normal direction. Then invert the Y coordinate of the
// normal, too.
TMeshVector3 v01 = v1.Position - v0.Position;
v01.Y = -v01.Y;
TMeshVector3 v02 = v2.Position - v0.Position;
v02.Y = -v02.Y;
TMeshVector3 normal = TMeshVector3::CrossProduct(v01, v02);
normal.Y = -normal.Y;
v0.TangentX = v1.TangentX = v2.TangentX = TMeshVector3(0.0f);
v0.TangentY = v1.TangentY = v2.TangentY = TMeshVector3(0.0f);
v0.TangentZ = v1.TangentZ = v2.TangentZ = normal.GetSafeNormal();
}
}
template <typename TIndex>
static TSharedPtr<Chaos::FTriangleMeshImplicitObject, ESPMode::ThreadSafe>
BuildChaosTriangleMeshes(
const TArray<FStaticMeshBuildVertex>& vertexData,
const TArray<uint32>& indices);
static const Material defaultMaterial;
static const MaterialPBRMetallicRoughness defaultPbrMetallicRoughness;
struct ColorVisitor {
bool duplicateVertices;
TArray<FStaticMeshBuildVertex>& StaticMeshBuildVertices;
const TArray<uint32>& indices;
bool operator()(AccessorView<nullptr_t>&& invalidView) { return false; }
template <typename TColorView> bool operator()(TColorView&& colorView) {
if (colorView.status() != AccessorViewStatus::Valid) {
return false;
}
bool success = true;
if (duplicateVertices) {
for (int i = 0; success && i < this->indices.Num(); ++i) {
FStaticMeshBuildVertex& vertex = this->StaticMeshBuildVertices[i];
uint32 vertexIndex = this->indices[i];
if (vertexIndex >= colorView.size()) {
success = false;
} else {
success =
ColorVisitor::convertColor(colorView[vertexIndex], vertex.Color);
}
}
} else {
for (int i = 0; success && i < this->StaticMeshBuildVertices.Num(); ++i) {
FStaticMeshBuildVertex& vertex = this->StaticMeshBuildVertices[i];
if (i >= colorView.size()) {
success = false;
} else {
success = ColorVisitor::convertColor(colorView[i], vertex.Color);
}
}
}
return success;
}
template <typename TElement>
static bool
convertColor(const AccessorTypes::VEC3<TElement>& color, FColor& out) {
out.A = 255;
return convertElement(color.value[0], out.R) &&
convertElement(color.value[1], out.G) &&
convertElement(color.value[2], out.B);
}
template <typename TElement>
static bool
convertColor(const AccessorTypes::VEC4<TElement>& color, FColor& out) {
return convertElement(color.value[0], out.R) &&
convertElement(color.value[1], out.G) &&
convertElement(color.value[2], out.B) &&
convertElement(color.value[3], out.A);
}
static bool convertElement(float value, uint8_t& out) {
out = uint8_t(value * 255.0f);
return true;
}
static bool convertElement(uint8_t value, uint8_t& out) {
out = value;
return true;
}
static bool convertElement(uint16_t value, uint8_t& out) {
out = uint8_t(value / 256);
return true;
}
template <typename T> static bool convertColor(const T& color, FColor& out) {
return false;
}
template <typename T>
static bool convertElement(const T& color, uint8_t& out) {
return false;
}
};
template <class T>
static TUniquePtr<CesiumTextureUtility::LoadedTextureResult> loadTexture(
CesiumGltf::Model& model,
const std::optional<T>& gltfTexture,
bool sRGB) {
if (!gltfTexture || gltfTexture.value().index < 0 ||
gltfTexture.value().index >= model.textures.size()) {
if (gltfTexture && gltfTexture.value().index >= 0) {
UE_LOG(
LogCesium,
Warning,
TEXT("Texture index must be less than %d, but is %d"),
model.textures.size(),
gltfTexture.value().index);
}
return nullptr;
}
const Texture& texture = model.textures[gltfTexture.value().index];
return loadTextureAnyThreadPart(model, texture, sRGB);
}
static void applyWaterMask(
Model& model,
const MeshPrimitive& primitive,
LoadPrimitiveResult& primitiveResult) {
// Initialize water mask if needed.
auto onlyWaterIt = primitive.extras.find("OnlyWater");
auto onlyLandIt = primitive.extras.find("OnlyLand");
if (onlyWaterIt != primitive.extras.end() && onlyWaterIt->second.isBool() &&
onlyLandIt != primitive.extras.end() && onlyLandIt->second.isBool()) {
TRACE_CPUPROFILER_EVENT_SCOPE(Cesium::ApplyWaterMask)
bool onlyWater = onlyWaterIt->second.getBoolOrDefault(false);
bool onlyLand = onlyLandIt->second.getBoolOrDefault(true);
primitiveResult.onlyWater = onlyWater;
primitiveResult.onlyLand = onlyLand;
if (!onlyWater && !onlyLand) {
// We have to use the water mask
auto waterMaskTextureIdIt = primitive.extras.find("WaterMaskTex");
if (waterMaskTextureIdIt != primitive.extras.end() &&
waterMaskTextureIdIt->second.isInt64()) {
int32_t waterMaskTextureId = static_cast<int32_t>(
waterMaskTextureIdIt->second.getInt64OrDefault(-1));
TextureInfo waterMaskInfo;
waterMaskInfo.index = waterMaskTextureId;
if (waterMaskTextureId >= 0 &&
waterMaskTextureId < model.textures.size()) {
primitiveResult.waterMaskTexture =
loadTexture(model, std::make_optional(waterMaskInfo), false);
}
}
}
} else {
primitiveResult.onlyWater = false;
primitiveResult.onlyLand = true;
}
auto waterMaskTranslationXIt = primitive.extras.find("WaterMaskTranslationX");
auto waterMaskTranslationYIt = primitive.extras.find("WaterMaskTranslationY");
auto waterMaskScaleIt = primitive.extras.find("WaterMaskScale");
if (waterMaskTranslationXIt != primitive.extras.end() &&
waterMaskTranslationXIt->second.isDouble() &&
waterMaskTranslationYIt != primitive.extras.end() &&
waterMaskTranslationYIt->second.isDouble() &&
waterMaskScaleIt != primitive.extras.end() &&
waterMaskScaleIt->second.isDouble()) {
primitiveResult.waterMaskTranslationX =
waterMaskTranslationXIt->second.getDoubleOrDefault(0.0);
primitiveResult.waterMaskTranslationY =
waterMaskTranslationYIt->second.getDoubleOrDefault(0.0);
primitiveResult.waterMaskScale =
waterMaskScaleIt->second.getDoubleOrDefault(1.0);
}
}
static FCesiumMetadataPrimitive
loadMetadataPrimitive(const Model& model, const MeshPrimitive& primitive) {
// NOTE: will have a deprecation period after which this function should no
// longer rely on model, only primitive.
const ExtensionMeshPrimitiveExtFeatureMetadata* pMetadata =
primitive.getExtension<ExtensionMeshPrimitiveExtFeatureMetadata>();
if (!pMetadata) {
return FCesiumMetadataPrimitive();
}
const ExtensionModelExtFeatureMetadata* pModelMetadata =
model.getExtension<ExtensionModelExtFeatureMetadata>();
if (!pModelMetadata) {
return FCesiumMetadataPrimitive{};
}
// This will change to no longer require the model-level extension
return FCesiumMetadataPrimitive(
model,
primitive,
*pMetadata,
*pModelMetadata);
}
static void updateTextureCoordinatesForMetadata(
const Model& model,
const MeshPrimitive& primitive,
bool duplicateVertices,
TArray<FStaticMeshBuildVertex>& vertices,
const TArray<uint32>& indices,
const EncodedMetadata& encodedMetadata,
const EncodedMetadataPrimitive& encodedPrimitiveMetadata,
const TArray<FCesiumFeatureIdAttribute>& featureIdAttributes,
TMap<FString, uint32_t>& metadataTextureCoordinateParameters,
std::unordered_map<uint32_t, uint32_t>& textureCoordinateMap) {
TRACE_CPUPROFILER_EVENT_SCOPE(Cesium::UpdateTextureCoordinatesForMetadata)
for (const EncodedFeatureIdTexture& encodedFeatureIdTexture :
encodedPrimitiveMetadata.encodedFeatureIdTextures) {
metadataTextureCoordinateParameters.Emplace(
encodedFeatureIdTexture.baseName + "UV",
updateTextureCoordinates(
model,
primitive,
duplicateVertices,
vertices,
indices,
"TEXCOORD_" +
std::to_string(
encodedFeatureIdTexture.textureCoordinateAttributeId),
textureCoordinateMap));
}
for (const FString& featureTextureName :
encodedPrimitiveMetadata.featureTextureNames) {
const EncodedFeatureTexture* pEncodedFeatureTexture =
encodedMetadata.encodedFeatureTextures.Find(featureTextureName);
if (pEncodedFeatureTexture) {
for (const EncodedFeatureTextureProperty& encodedProperty :
pEncodedFeatureTexture->properties) {
metadataTextureCoordinateParameters.Emplace(
encodedProperty.baseName + "UV",
updateTextureCoordinates(
model,
primitive,
duplicateVertices,
vertices,
indices,
"TEXCOORD_" + std::to_string(
encodedProperty.textureCoordinateAttributeId),
textureCoordinateMap));
}
}
}
const ExtensionMeshPrimitiveExtFeatureMetadata* pMetadata =
primitive.getExtension<ExtensionMeshPrimitiveExtFeatureMetadata>();
if (pMetadata) {
for (const EncodedFeatureIdAttribute& encodedFeatureIdAttribute :
encodedPrimitiveMetadata.encodedFeatureIdAttributes) {
const FCesiumFeatureIdAttribute& featureIdAttribute =
featureIdAttributes[encodedFeatureIdAttribute.index];
int32_t attribute = featureIdAttribute.getAttributeIndex();
uint32_t textureCoordinateIndex = textureCoordinateMap.size();
textureCoordinateMap[attribute] = textureCoordinateIndex;
metadataTextureCoordinateParameters.Emplace(
encodedFeatureIdAttribute.name,
textureCoordinateIndex);
int64 vertexCount =
UCesiumFeatureIdAttributeBlueprintLibrary::GetVertexCount(
featureIdAttribute);
// We encode unsigned integer feature ids as floats in the u-channel of
// a texture coordinate slot.
if (duplicateVertices) {
for (int64_t i = 0; i < indices.Num(); ++i) {
FStaticMeshBuildVertex& vertex = vertices[i];
uint32 vertexIndex = indices[i];
if (vertexIndex >= 0 && vertexIndex < vertexCount) {
float featureId = static_cast<float>(
UCesiumFeatureIdAttributeBlueprintLibrary::
GetFeatureIDForVertex(featureIdAttribute, vertexIndex));
vertex.UVs[textureCoordinateIndex] = TMeshVector2(featureId, 0.0f);
} else {
vertex.UVs[textureCoordinateIndex] = TMeshVector2(0.0f, 0.0f);
}
}
} else {
for (int64_t i = 0; i < vertices.Num(); ++i) {
FStaticMeshBuildVertex& vertex = vertices[i];
if (i < vertexCount) {
float featureId = static_cast<float>(
UCesiumFeatureIdAttributeBlueprintLibrary::
GetFeatureIDForVertex(featureIdAttribute, i));
vertex.UVs[textureCoordinateIndex] = TMeshVector2(featureId, 0.0f);
} else {
vertex.UVs[textureCoordinateIndex] = TMeshVector2(0.0f, 0.0f);
}
}
}
}
}
}
namespace {
/**
* @brief Constrain the length of the given string.
*
* If the string is shorter than the maximum length, it is returned.
* If it is not longer than 3 characters, the first maxLength
* characters will be returned.
* Otherwise, the result will be of the form `prefix + "..." + suffix`,
* with the prefix and suffix chosen so that the length of the result
* is maxLength
*
* @param s The input string
* @param maxLength The maximum length.
* @return The constrained string
*/
std::string constrainLength(const std::string& s, const size_t maxLength) {
if (s.length() <= maxLength) {
return s;
}
if (maxLength <= 3) {
return s.substr(0, maxLength);
}
const std::string ellipsis("...");
const size_t prefixLength = ((maxLength - ellipsis.length()) + 1) / 2;
const size_t suffixLength = (maxLength - ellipsis.length()) / 2;
const std::string prefix = s.substr(0, prefixLength);
const std::string suffix = s.substr(s.length() - suffixLength, suffixLength);
return prefix + ellipsis + suffix;
}
/**
* @brief Create an FName from the given strings.
*
* This will combine the prefix and the suffix and create an FName.
* If the string would be longer than the given length, then
* the prefix will be shortened (in an unspecified way), to
* constrain the result to a length of maxLength.
*
* The default maximum length is 256, because Unreal may in turn
* add a prefix like the `/Internal/Path/Name` to this name.
*
* @param prefix The prefix input string
* @param suffix The suffix input string
* @param maxLength The maximum length
* @return The FName
*/
FName createSafeName(
const std::string& prefix,
const std::string& suffix,
const size_t maxLength = 256) {
std::string constrainedPrefix =
constrainLength(prefix, maxLength - suffix.length());
std::string combined = constrainedPrefix + suffix;
return FName(combined.c_str());
}
} // namespace
template <class TIndexAccessor>
static void loadPrimitive(
LoadPrimitiveResult& primitiveResult,
const glm::dmat4x4& transform,
const CreatePrimitiveOptions& options,
const Accessor& positionAccessor,
const AccessorView<TMeshVector3>& positionView,
const TIndexAccessor& indicesView) {
TRACE_CPUPROFILER_EVENT_SCOPE(Cesium::loadPrimitive<T>)
Model& model = *options.pMeshOptions->pNodeOptions->pModelOptions->pModel;
const Mesh& mesh = *options.pMeshOptions->pMesh;
const MeshPrimitive& primitive = *options.pPrimitive;
if (primitive.mode != MeshPrimitive::Mode::TRIANGLES &&
primitive.mode != MeshPrimitive::Mode::TRIANGLE_STRIP &&
primitive.mode != MeshPrimitive::Mode::POINTS) {
// TODO: add support for other primitive types.
UE_LOG(
LogCesium,
Warning,
TEXT("Primitive mode %d is not supported"),
primitive.mode);
return;
}
std::string name = "glTF";
auto urlIt = model.extras.find("Cesium3DTiles_TileUrl");
if (urlIt != model.extras.end()) {
name = urlIt->second.getStringOrDefault("glTF");
name = constrainLength(name, 256);
}
auto meshIt = std::find_if(
model.meshes.begin(),
model.meshes.end(),
[&mesh](const Mesh& candidate) { return &candidate == &mesh; });
if (meshIt != model.meshes.end()) {
int64_t meshIndex = meshIt - model.meshes.begin();
name += " mesh " + std::to_string(meshIndex);
}
auto primitiveIt = std::find_if(
mesh.primitives.begin(),
mesh.primitives.end(),
[&primitive](const MeshPrimitive& candidate) {
return &candidate == &primitive;
});
if (primitiveIt != mesh.primitives.end()) {
int64_t primitiveIndex = primitiveIt - mesh.primitives.begin();
name += " primitive " + std::to_string(primitiveIndex);
}
primitiveResult.name = name;
if (positionView.status() != AccessorViewStatus::Valid) {
UE_LOG(
LogCesium,
Warning,
TEXT("%s: Invalid position buffer"),
UTF8_TO_TCHAR(name.c_str()));
return;
}
if constexpr (IsAccessorView<TIndexAccessor>::value) {
if (indicesView.status() != AccessorViewStatus::Valid) {
UE_LOG(
LogCesium,
Warning,
TEXT("%s: Invalid indices buffer"),
UTF8_TO_TCHAR(name.c_str()));
return;
}
}
auto normalAccessorIt = primitive.attributes.find("NORMAL");
AccessorView<TMeshVector3> normalAccessor;
bool hasNormals = false;
if (normalAccessorIt != primitive.attributes.end()) {
int normalAccessorID = normalAccessorIt->second;
normalAccessor = AccessorView<TMeshVector3>(model, normalAccessorID);
hasNormals = normalAccessor.status() == AccessorViewStatus::Valid;
if (!hasNormals) {
UE_LOG(
LogCesium,
Warning,
TEXT(
"%s: Invalid normal buffer. Flat normals will be auto-generated instead."),
UTF8_TO_TCHAR(name.c_str()));
}
}
int materialID = primitive.material;
const Material& material =
materialID >= 0 && materialID < model.materials.size()
? model.materials[materialID]
: defaultMaterial;
primitiveResult.isUnlit =
material.hasExtension<ExtensionKhrMaterialsUnlit>() &&
!options.pMeshOptions->pNodeOptions->pModelOptions
->ignoreKhrMaterialsUnlit;
const MaterialPBRMetallicRoughness& pbrMetallicRoughness =
material.pbrMetallicRoughness ? material.pbrMetallicRoughness.value()
: defaultPbrMetallicRoughness;
bool hasNormalMap = material.normalTexture.has_value();
if (hasNormalMap) {
const Texture* pTexture =
Model::getSafe(&model.textures, material.normalTexture->index);
hasNormalMap = pTexture != nullptr &&
Model::getSafe(&model.images, pTexture->source) != nullptr;
}
bool needsTangents =
hasNormalMap ||
options.pMeshOptions->pNodeOptions->pModelOptions->alwaysIncludeTangents;
bool hasTangents = false;
auto tangentAccessorIt = primitive.attributes.find("TANGENT");
AccessorView<TMeshVector4> tangentAccessor;
if (tangentAccessorIt != primitive.attributes.end()) {
int tangentAccessorID = tangentAccessorIt->second;
tangentAccessor = AccessorView<TMeshVector4>(model, tangentAccessorID);
hasTangents = tangentAccessor.status() == AccessorViewStatus::Valid;
if (!hasTangents) {
UE_LOG(
LogCesium,
Warning,
TEXT("%s: Invalid tangent buffer."),
UTF8_TO_TCHAR(name.c_str()));
}
}
applyWaterMask(model, primitive, primitiveResult);
// The water effect works by animating the normal, and the normal is
// expressed in tangent space. So if we have water, we need tangents.
if (primitiveResult.onlyWater || primitiveResult.waterMaskTexture) {
needsTangents = true;
}
TUniquePtr<FStaticMeshRenderData> RenderData =
MakeUnique<FStaticMeshRenderData>();
RenderData->AllocateLODResources(1);
FStaticMeshLODResources& LODResources = RenderData->LODResources[0];
{
TRACE_CPUPROFILER_EVENT_SCOPE(Cesium::ComputeAABB)
const std::vector<double>& min = positionAccessor.min;
const std::vector<double>& max = positionAccessor.max;
glm::dvec3 minPosition{std::numeric_limits<double>::max()};
glm::dvec3 maxPosition{std::numeric_limits<double>::lowest()};
if (min.size() != 3 || max.size() != 3) {
for (int32_t i = 0; i < positionView.size(); ++i) {
minPosition.x = glm::min<double>(minPosition.x, positionView[i].X);
minPosition.y = glm::min<double>(minPosition.y, positionView[i].Y);
minPosition.z = glm::min<double>(minPosition.z, positionView[i].Z);
maxPosition.x = glm::max<double>(maxPosition.x, positionView[i].X);
maxPosition.y = glm::max<double>(maxPosition.y, positionView[i].Y);
maxPosition.z = glm::max<double>(maxPosition.z, positionView[i].Z);
}
} else {
minPosition = glm::dvec3(min[0], min[1], min[2]);
maxPosition = glm::dvec3(max[0], max[1], max[2]);
}
primitiveResult.dimensions =
glm::vec3(transform * glm::dvec4(maxPosition - minPosition, 0));
FBox aaBox(
FVector3d(minPosition.x, -minPosition.y, minPosition.z),
FVector3d(maxPosition.x, -maxPosition.y, maxPosition.z));
aaBox.GetCenterAndExtents(
RenderData->Bounds.Origin,
RenderData->Bounds.BoxExtent);
RenderData->Bounds.SphereRadius = 0.0f;
}
TArray<uint32> indices;
if (primitive.mode == MeshPrimitive::Mode::TRIANGLES ||
primitive.mode == MeshPrimitive::Mode::POINTS) {
TRACE_CPUPROFILER_EVENT_SCOPE(Cesium::CopyIndices)
indices.SetNum(static_cast<TArray<uint32>::SizeType>(indicesView.size()));
for (int32 i = 0; i < indicesView.size(); ++i) {
indices[i] = indicesView[i];
}
} else {
// assume TRIANGLE_STRIP because all others are rejected earlier.
TRACE_CPUPROFILER_EVENT_SCOPE(Cesium::CopyIndices)
indices.SetNum(
static_cast<TArray<uint32>::SizeType>(3 * (indicesView.size() - 2)));
for (int32 i = 0; i < indicesView.size() - 2; ++i) {
if (i % 2) {
indices[3 * i] = indicesView[i];
indices[3 * i + 1] = indicesView[i + 2];
indices[3 * i + 2] = indicesView[i + 1];
} else {
indices[3 * i] = indicesView[i];
indices[3 * i + 1] = indicesView[i + 1];
indices[3 * i + 2] = indicesView[i + 2];
}
}
}
// If we don't have normals, the gltf spec prescribes that the client
// implementation must generate flat normals, which requires duplicating
// vertices shared by multiple triangles. If we don't have tangents, but
// need them, we need to use a tangent space generation algorithm which
// requires duplicated vertices.
bool duplicateVertices = !hasNormals || (needsTangents && !hasTangents);
duplicateVertices =
duplicateVertices && primitive.mode != MeshPrimitive::Mode::POINTS;
TArray<FStaticMeshBuildVertex> StaticMeshBuildVertices;
StaticMeshBuildVertices.SetNum(
duplicateVertices ? indices.Num()
: static_cast<int>(positionView.size()));
{
if (duplicateVertices) {
TRACE_CPUPROFILER_EVENT_SCOPE(Cesium::CopyDuplicatedPositions)
for (int i = 0; i < indices.Num(); ++i) {
FStaticMeshBuildVertex& vertex = StaticMeshBuildVertices[i];
uint32 vertexIndex = indices[i];
const TMeshVector3& pos = positionView[vertexIndex];
vertex.Position.X = pos.X;
vertex.Position.Y = -pos.Y;
vertex.Position.Z = pos.Z;
vertex.UVs[0] = TMeshVector2(0.0f, 0.0f);
vertex.UVs[2] = TMeshVector2(0.0f, 0.0f);
RenderData->Bounds.SphereRadius = FMath::Max(
(FVector(vertex.Position) - RenderData->Bounds.Origin).Size(),
RenderData->Bounds.SphereRadius);
}
} else {
TRACE_CPUPROFILER_EVENT_SCOPE(Cesium::CopyPositions)
for (int i = 0; i < StaticMeshBuildVertices.Num(); ++i) {
FStaticMeshBuildVertex& vertex = StaticMeshBuildVertices[i];
const TMeshVector3& pos = positionView[i];
vertex.Position.X = pos.X;
vertex.Position.Y = -pos.Y;
vertex.Position.Z = pos.Z;
vertex.UVs[0] = TMeshVector2(0.0f, 0.0f);
vertex.UVs[2] = TMeshVector2(0.0f, 0.0f);
RenderData->Bounds.SphereRadius = FMath::Max(
(FVector(vertex.Position) - RenderData->Bounds.Origin).Size(),
RenderData->Bounds.SphereRadius);
}
}
}
bool hasVertexColors = false;
auto colorAccessorIt = primitive.attributes.find("COLOR_0");
if (colorAccessorIt != primitive.attributes.end()) {
TRACE_CPUPROFILER_EVENT_SCOPE(Cesium::CopyVertexColors)
int colorAccessorID = colorAccessorIt->second;
hasVertexColors = createAccessorView(
model,
colorAccessorID,
ColorVisitor{duplicateVertices, StaticMeshBuildVertices, indices});
}
LODResources.bHasColorVertexData = hasVertexColors;
// We need to copy the texture coordinates associated with each texture (if
// any) into the the appropriate UVs slot in FStaticMeshBuildVertex.
std::unordered_map<uint32_t, uint32_t>& textureCoordinateMap =
primitiveResult.textureCoordinateMap;
{
TRACE_CPUPROFILER_EVENT_SCOPE(Cesium::loadTextures)
primitiveResult.baseColorTexture =
loadTexture(model, pbrMetallicRoughness.baseColorTexture, true);
primitiveResult.metallicRoughnessTexture = loadTexture(
model,
pbrMetallicRoughness.metallicRoughnessTexture,
false);
primitiveResult.normalTexture =
loadTexture(model, material.normalTexture, false);
primitiveResult.occlusionTexture =
loadTexture(model, material.occlusionTexture, false);
primitiveResult.emissiveTexture =
loadTexture(model, material.emissiveTexture, true);
}
{
TRACE_CPUPROFILER_EVENT_SCOPE(Cesium::UpdateTextureCoordinates)
primitiveResult
.textureCoordinateParameters["baseColorTextureCoordinateIndex"] =
updateTextureCoordinates(
model,
primitive,
duplicateVertices,
StaticMeshBuildVertices,
indices,
pbrMetallicRoughness.baseColorTexture,
textureCoordinateMap);
primitiveResult.textureCoordinateParameters
["metallicRoughnessTextureCoordinateIndex"] = updateTextureCoordinates(
model,
primitive,