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Change flip texture coordinates with flip texture #562

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Change flip texture coordinates with flip texture #562

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ddea343
Change flip texture coordinates with flip texture. Better not to flip…
owilliamailliwo Feb 17, 2020
304a4e1
Fix bug, don't need to invert the Y coordinates of offset anymore.
owilliamailliwo Apr 12, 2020
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53 changes: 49 additions & 4 deletions UnityGLTF/Assets/UnityGLTF/Runtime/Scripts/GLTFSceneExporter.cs
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Expand Up @@ -314,7 +314,17 @@ public void SaveGLTFandBin(string path, string fileName)
binFile.Close();
#endif
ExportImages(path);
}

private Texture2D FlipTexture(Texture source, Texture2D flipped, RenderTextureFormat format, RenderTextureReadWrite readWrite)
{
var flippedRenderTexture = RenderTexture.GetTemporary(source.width, source.height, 0, format, readWrite);
Graphics.Blit(source, flippedRenderTexture, new Vector2(1.0f, -1.0f), new Vector2(0.0f, 1.0f));
flipped.name = source.name;
flipped.ReadPixels(new Rect(0, 0, flippedRenderTexture.width, flippedRenderTexture.height), 0, 0);
flipped.Apply();
RenderTexture.ReleaseTemporary(flippedRenderTexture);
return flipped;
}

private void ExportImages(string outputPath)
Expand Down Expand Up @@ -349,6 +359,8 @@ private void ExportImages(string outputPath)
/// <param name="outputPath">The location to export the texture</param>
private void ExportMetallicGlossTexture(Texture2D texture, string outputPath)
{
var flipped = new Texture2D(texture.width, texture.height);
texture = FlipTexture(texture, flipped, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Linear);
var destRenderTexture = RenderTexture.GetTemporary(texture.width, texture.height, 0, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Linear);

Graphics.Blit(texture, destRenderTexture, _metalGlossChannelSwapMaterial);
Expand All @@ -364,10 +376,12 @@ private void ExportMetallicGlossTexture(Texture2D texture, string outputPath)
if (Application.isEditor)
{
GameObject.DestroyImmediate(exportTexture);
GameObject.DestroyImmediate(flipped);
}
else
{
GameObject.Destroy(exportTexture);
GameObject.Destroy(flipped);
}
}

Expand All @@ -379,6 +393,8 @@ private void ExportMetallicGlossTexture(Texture2D texture, string outputPath)
/// <param name="outputPath">The location to export the texture</param>
private void ExportNormalTexture(Texture2D texture, string outputPath)
{
var flipped = new Texture2D(texture.width, texture.height);
texture = FlipTexture(texture, flipped, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Linear);
var destRenderTexture = RenderTexture.GetTemporary(texture.width, texture.height, 0, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Linear);

Graphics.Blit(texture, destRenderTexture, _normalChannelMaterial);
Expand All @@ -394,15 +410,19 @@ private void ExportNormalTexture(Texture2D texture, string outputPath)
if (Application.isEditor)
{
GameObject.DestroyImmediate(exportTexture);
GameObject.DestroyImmediate(flipped);
}
else
{
GameObject.Destroy(exportTexture);
GameObject.Destroy(flipped);
}
}

private void ExportTexture(Texture2D texture, string outputPath)
{
var flipped = new Texture2D(texture.width, texture.height);
texture = FlipTexture(texture, flipped, RenderTextureFormat.ARGB32, RenderTextureReadWrite.sRGB);
var destRenderTexture = RenderTexture.GetTemporary(texture.width, texture.height, 0, RenderTextureFormat.ARGB32, RenderTextureReadWrite.sRGB);

Graphics.Blit(texture, destRenderTexture);
Expand All @@ -418,10 +438,12 @@ private void ExportTexture(Texture2D texture, string outputPath)
if (Application.isEditor)
{
GameObject.DestroyImmediate(exportTexture);
GameObject.DestroyImmediate(flipped);
}
else
{
GameObject.Destroy(exportTexture);
GameObject.Destroy(flipped);
}
}

Expand Down Expand Up @@ -750,7 +772,8 @@ private MeshPrimitive[] ExportPrimitive(GameObject gameObject, GLTFMesh mesh)
}

AccessorId aPosition = null, aNormal = null, aTangent = null,
aTexcoord0 = null, aTexcoord1 = null, aColor0 = null;
aTexcoord0 = null, aTexcoord1 = null, aTexcoord2 = null, aTexcoord3 = null,
aColor0 = null, aJoint0 = null, aWeight0 = null;

aPosition = ExportAccessor(SchemaExtensions.ConvertVector3CoordinateSpaceAndCopy(meshObj.vertices, SchemaExtensions.CoordinateSpaceConversionScale));

Expand All @@ -760,12 +783,30 @@ private MeshPrimitive[] ExportPrimitive(GameObject gameObject, GLTFMesh mesh)
if (meshObj.tangents.Length != 0)
aTangent = ExportAccessor(SchemaExtensions.ConvertVector4CoordinateSpaceAndCopy(meshObj.tangents, SchemaExtensions.TangentSpaceConversionScale));

// Better not to flip the texture coordinates. If uv* represents something else other than coordinates, we cannot simply perform 1 - uv*.y on it.
//if (meshObj.uv.Length != 0)
// aTexcoord0 = ExportAccessor(SchemaExtensions.FlipTexCoordArrayVAndCopy(meshObj.uv));

//if (meshObj.uv2.Length != 0)
// aTexcoord1 = ExportAccessor(SchemaExtensions.FlipTexCoordArrayVAndCopy(meshObj.uv2));

//if (meshObj.uv3.Length != 0)
// aTexcoord2 = ExportAccessor(SchemaExtensions.FlipTexCoordArrayVAndCopy(meshObj.uv3));

//if (meshObj.uv4.Length != 0)
// aTexcoord3 = ExportAccessor(SchemaExtensions.FlipTexCoordArrayVAndCopy(meshObj.uv4));

if (meshObj.uv.Length != 0)
aTexcoord0 = ExportAccessor(SchemaExtensions.FlipTexCoordArrayVAndCopy(meshObj.uv));
aTexcoord0 = ExportAccessor(meshObj.uv);

if (meshObj.uv2.Length != 0)
aTexcoord1 = ExportAccessor(SchemaExtensions.FlipTexCoordArrayVAndCopy(meshObj.uv2));
aTexcoord1 = ExportAccessor(meshObj.uv2);

if (meshObj.uv3.Length != 0)
aTexcoord2 = ExportAccessor(meshObj.uv3);

if (meshObj.uv4.Length != 0)
aTexcoord3 = ExportAccessor(meshObj.uv4);
if (meshObj.colors.Length != 0)
aColor0 = ExportAccessor(meshObj.colors);

Expand Down Expand Up @@ -793,6 +834,10 @@ private MeshPrimitive[] ExportPrimitive(GameObject gameObject, GLTFMesh mesh)
primitive.Attributes.Add(SemanticProperties.TEXCOORD_0, aTexcoord0);
if (aTexcoord1 != null)
primitive.Attributes.Add(SemanticProperties.TEXCOORD_1, aTexcoord1);
if (aTexcoord2 != null)
primitive.Attributes.Add(SemanticProperties.TEXCOORD_2, aTexcoord2);
if (aTexcoord3 != null)
primitive.Attributes.Add(SemanticProperties.TEXCOORD_3, aTexcoord3);
if (aColor0 != null)
primitive.Attributes.Add(SemanticProperties.COLOR_0, aColor0);

Expand Down Expand Up @@ -1033,7 +1078,7 @@ private void ExportTextureTransform(TextureInfo def, Material mat, string texNam
def.Extensions = new Dictionary<string, IExtension>();

def.Extensions[ExtTextureTransformExtensionFactory.EXTENSION_NAME] = new ExtTextureTransformExtension(
new GLTF.Math.Vector2(offset.x, -offset.y),
new GLTF.Math.Vector2(offset.x, offset.y),
0, // TODO: support rotation
new GLTF.Math.Vector2(scale.x, scale.y),
0 // TODO: support UV channels
Expand Down