/
write.go
155 lines (131 loc) · 4.36 KB
/
write.go
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package ply
import (
"encoding/binary"
"fmt"
"io"
"github.com/EliCDavis/bitlib"
"github.com/EliCDavis/polyform/modeling"
)
func writeHeader(out io.Writer, model modeling.Mesh, attributes []string, vertexCount int) error {
if len(model.Materials()) > 0 && model.Materials()[0].Material != nil {
mat := model.Materials()[0].Material
if mat.ColorTextureURI != nil {
fmt.Fprintf(out, "comment TextureFile %s\n", *mat.ColorTextureURI)
}
}
fmt.Fprintln(out, "comment Created with github.com/EliCDavis/polyform")
vertexElement := buildVertexElements(attributes, vertexCount)
vertexElement.Write(out)
if model.Topology() != modeling.PointTopology && model.Topology() != modeling.TriangleTopology {
panic(fmt.Errorf("unimplemented ply topology export: %s", model.Topology().String()))
}
if model.Topology() == modeling.TriangleTopology {
fmt.Fprintf(out, "element face %d\n", model.PrimitiveCount())
fmt.Fprintln(out, "property list uchar int vertex_indices")
if model.HasFloat2Attribute(modeling.TexCoordAttribute) {
fmt.Fprintln(out, "property list uchar float texcoord")
}
}
_, err := fmt.Fprintln(out, "end_header")
return err
}
func WriteASCII(out io.Writer, model modeling.Mesh) error {
fmt.Fprintln(out, "ply")
fmt.Fprintln(out, "format ascii 1.0")
attributes := model.Float3Attributes()
vertexCount := model.AttributeLength()
if err := writeHeader(out, model, attributes, vertexCount); err != nil {
return err
}
for i := 0; i < vertexCount; i++ {
for atrI, atr := range attributes {
v := model.Float3Attribute(atr).At(i)
if atr == modeling.ColorAttribute {
fmt.Fprintf(out, "%d %d %d", int(v.X()*255), int(v.Y()*255), int(v.Z()*255))
} else {
fmt.Fprintf(out, "%f %f %f", v.X(), v.Y(), v.Z())
}
if atrI < len(attributes)-1 {
fmt.Fprintf(out, " ")
}
}
fmt.Fprint(out, "\n")
}
if model.Topology() == modeling.TriangleTopology {
if model.HasFloat2Attribute(modeling.TexCoordAttribute) {
for i := 0; i < model.PrimitiveCount(); i++ {
tri := model.Tri(i)
fmt.Fprintf(
out,
"3 %d %d %d 6 %f %f %f %f %f %f\n",
tri.P1(),
tri.P2(),
tri.P3(),
tri.P1Vec2Attr(modeling.TexCoordAttribute).X(),
tri.P1Vec2Attr(modeling.TexCoordAttribute).Y(),
tri.P2Vec2Attr(modeling.TexCoordAttribute).X(),
tri.P2Vec2Attr(modeling.TexCoordAttribute).Y(),
tri.P3Vec2Attr(modeling.TexCoordAttribute).X(),
tri.P3Vec2Attr(modeling.TexCoordAttribute).Y(),
)
}
} else {
for i := 0; i < model.PrimitiveCount(); i++ {
tri := model.Tri(i)
fmt.Fprintf(out, "3 %d %d %d\n", tri.P1(), tri.P2(), tri.P3())
}
}
}
return nil
}
func WriteBinary(out io.Writer, model modeling.Mesh) error {
fmt.Fprintln(out, "ply")
fmt.Fprintln(out, "format binary_little_endian 1.0")
attributes := model.Float3Attributes()
vertexCount := model.AttributeLength()
if err := writeHeader(out, model, attributes, vertexCount); err != nil {
return err
}
writer := bitlib.NewWriter(out, binary.LittleEndian)
for i := 0; i < vertexCount; i++ {
for _, atr := range attributes {
v := model.Float3Attribute(atr).At(i)
if atr == modeling.ColorAttribute {
writer.Byte(byte(v.X() * 255))
writer.Byte(byte(v.Y() * 255))
writer.Byte(byte(v.Z() * 255))
} else {
writer.Float32(float32(v.X()))
writer.Float32(float32(v.Y()))
writer.Float32(float32(v.Z()))
}
}
}
if model.Topology() == modeling.TriangleTopology {
if model.HasFloat2Attribute(modeling.TexCoordAttribute) {
for i := 0; i < model.PrimitiveCount(); i++ {
tri := model.Tri(i)
writer.Byte(3)
writer.Int32(int32(tri.P1()))
writer.Int32(int32(tri.P2()))
writer.Int32(int32(tri.P3()))
writer.Byte(6)
writer.Float32(float32(tri.P1Vec2Attr(modeling.TexCoordAttribute).X()))
writer.Float32(float32(tri.P1Vec2Attr(modeling.TexCoordAttribute).Y()))
writer.Float32(float32(tri.P2Vec2Attr(modeling.TexCoordAttribute).X()))
writer.Float32(float32(tri.P2Vec2Attr(modeling.TexCoordAttribute).Y()))
writer.Float32(float32(tri.P3Vec2Attr(modeling.TexCoordAttribute).X()))
writer.Float32(float32(tri.P3Vec2Attr(modeling.TexCoordAttribute).Y()))
}
} else {
for i := 0; i < model.PrimitiveCount(); i++ {
tri := model.Tri(i)
writer.Byte(3)
writer.Int32(int32(tri.P1()))
writer.Int32(int32(tri.P2()))
writer.Int32(int32(tri.P3()))
}
}
}
return writer.Error()
}