void HandleBaseColor(Rhino.DocObjects.Material rhinoMaterial, glTFLoader.Schema.Material gltfMaterial)
{
Rhino.DocObjects.Texture baseColorDoc = rhinoMaterial.GetTexture(TextureType.PBR_BaseColor);
Rhino.DocObjects.Texture alphaTextureDoc = rhinoMaterial.GetTexture(TextureType.PBR_Alpha);
RenderTexture baseColorTexture = rhinoMaterial.RenderMaterial.GetTextureFromUsage(RenderMaterial.StandardChildSlots.PbrBaseColor);
RenderTexture alphaTexture = rhinoMaterial.RenderMaterial.GetTextureFromUsage(RenderMaterial.StandardChildSlots.PbrAlpha);
bool baseColorLinear = baseColorTexture == null ? false : IsLinear(baseColorTexture);
bool hasBaseColorTexture = baseColorDoc == null ? false : baseColorDoc.Enabled;
bool hasAlphaTexture = alphaTextureDoc == null ? false : alphaTextureDoc.Enabled;
bool baseColorDiffuseAlphaForTransparency = rhinoMaterial.PhysicallyBased.UseBaseColorTextureAlphaForObjectAlphaTransparencyTexture;
Color4f baseColor = rhinoMaterial.PhysicallyBased.BaseColor;
if (workflow.PreProcessColors)
{
baseColor = Color4f.ApplyGamma(baseColor, workflow.PreProcessGamma);
}
if (!hasBaseColorTexture && !hasAlphaTexture)
{
gltfMaterial.PbrMetallicRoughness.BaseColorFactor = new float[]
{
baseColor.R,
baseColor.G,
baseColor.B,
(float)rhinoMaterial.PhysicallyBased.Alpha,
};
if (rhinoMaterial.PhysicallyBased.Alpha == 1.0)
{
gltfMaterial.AlphaMode = glTFLoader.Schema.Material.AlphaModeEnum.OPAQUE;
}
else
{
gltfMaterial.AlphaMode = glTFLoader.Schema.Material.AlphaModeEnum.BLEND;
}
}
else
{
gltfMaterial.PbrMetallicRoughness.BaseColorTexture = CombineBaseColorAndAlphaTexture(baseColorTexture, alphaTexture, baseColorDiffuseAlphaForTransparency, baseColor, baseColorLinear, (float)rhinoMaterial.PhysicallyBased.Alpha, out bool hasAlpha);
if (hasAlpha)
{
gltfMaterial.AlphaMode = glTFLoader.Schema.Material.AlphaModeEnum.BLEND;
}
else
{
gltfMaterial.AlphaMode = glTFLoader.Schema.Material.AlphaModeEnum.OPAQUE;
}
}
}
public static Color4f ConvertSRGBToLinear(Color4f color)
{
return(Color4f.ApplyGamma(color, 2.4f));
}
TextureInfo CombineBaseColorAndAlphaTexture(Rhino.Render.RenderTexture baseColorTexture, Rhino.Render.RenderTexture alphaTexture, bool baseColorDiffuseAlphaForTransparency, Color4f baseColor, bool baseColorLinear)
{
bool hasBaseColorTexture = baseColorTexture != null;
int baseColorWidth, baseColorHeight, baseColorDepth;
baseColorWidth = baseColorHeight = baseColorDepth = 0;
if (hasBaseColorTexture)
{
baseColorTexture.PixelSize(out baseColorWidth, out baseColorHeight, out baseColorDepth);
}
alphaTexture.PixelSize(out int alphaWidth, out int alphaHeight, out int alphaDepth);
int width = Math.Max(baseColorWidth, alphaWidth);
int height = Math.Max(baseColorHeight, alphaHeight);
if (width <= 0)
{
width = 1024;
}
if (height <= 0)
{
height = 1024;
}
TextureEvaluator baseColorTextureEvaluator = baseColorTexture.CreateEvaluator(RenderTexture.TextureEvaluatorFlags.Normal);
TextureEvaluator alphaTextureEvaluator = alphaTexture.CreateEvaluator(RenderTexture.TextureEvaluatorFlags.Normal);
Bitmap bitmap = new Bitmap(width, height);
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++)
{
double x = (double)i / ((double)(width - 1));
double y = (double)j / ((double)(height - 1));
y = 1.0 - y;
Point3d uvw = new Point3d(x, y, 0.0);
Color4f baseColorOut = baseColor;
if (hasBaseColorTexture)
{
baseColorOut = baseColorTextureEvaluator.GetColor(uvw, Vector3d.Zero, Vector3d.Zero);
if (baseColorLinear)
{
baseColorOut = Color4f.ApplyGamma(baseColorOut, workflow.PreProcessGamma);
}
}
if (!baseColorDiffuseAlphaForTransparency)
{
baseColorOut = new Color4f(baseColorOut.R, baseColorOut.G, baseColorOut.B, 1.0f);
}
Color4f alphaColor = alphaTextureEvaluator.GetColor(uvw, Vector3d.Zero, Vector3d.Zero);
float alpha = baseColor.A * alphaColor.L;
Color4f colorFinal = new Color4f(baseColorOut.R, baseColorOut.G, baseColorOut.B, alpha);
bitmap.SetPixel(i, j, colorFinal.AsSystemColor());
}
}
bitmap.Save(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "out.png"));
return(GetTextureInfoFromBitmap(bitmap));
}