private GLTFBufferView WriteImageToGltfBuffer(GLTF gltf, GLTFImage gltfImage, string imageSourcePath = null, Bitmap imageBitmap = null, long textureQuality = 100)
{
byte[] imageBytes = null;
if (imageBitmap != null)
{
// try our best to get extension - default will be png which is the looseless format.
var extension = gltfImage.FileExtension ?? (gltfImage.uri != null ? Path.GetExtension(gltfImage.uri) : null);
var outputFormat = extension != null?TextureUtilities.GetImageFormat(gltfImage.FileExtension) : ImageFormat.Png;
using (MemoryStream m = new MemoryStream())
{
// this use the SAME method for GLTF
TextureUtilities.SaveBitmap(m, imageBitmap, outputFormat, textureQuality);
imageBytes = m.ToArray();
}
}
else
{
imageBytes = File.ReadAllBytes(imageSourcePath);
}
// Chunk must be padded with trailing zeros (0x00) to satisfy alignment requirements
imageBytes = padChunk(imageBytes, 4, 0x00);
// BufferView - Image
var buffer = gltf.buffer;
var imageBufferView = new GLTFBufferView
{
name = "bufferViewImage",
buffer = buffer.index,
Buffer = buffer,
byteOffset = buffer.byteLength
};
imageBufferView.index = gltf.BufferViewsList.Count;
gltf.BufferViewsList.Add(imageBufferView);
imageBufferView.bytesList.AddRange(imageBytes);
imageBufferView.byteLength += imageBytes.Length;
imageBufferView.Buffer.byteLength += imageBytes.Length;
imageBufferView.Buffer.bytesList.AddRange(imageBufferView.bytesList);
return(imageBufferView);
}
/// <returns></returns>
private BabylonTexture ExportBaseColorAlphaTexture(ITexmap baseColorTexMap, ITexmap alphaTexMap, float[] baseColor, float alpha, BabylonScene babylonScene, string materialName, bool isOpacity = false)
{
// --- Babylon texture ---
var baseColorTexture = _getBitmapTex(baseColorTexMap);
var alphaTexture = _getBitmapTex(alphaTexMap);
string baseColorTextureMapExtension = null;
// If we don't retrieve any textures from Max, return null.
if (baseColorTexture == null && alphaTexture == null)
{
return(null);
}
// If we only have a base color texture, and we are using an opaque texture, export the base color image only.
if (baseColorTexture != null && alphaTexture == null)
{
baseColorTextureMapExtension = Path.GetExtension(baseColorTexture.Map.FullFilePath).ToLower();
if (alpha == 1)
{
if (baseColorTexture.AlphaSource == MaxConstants.IMAGE_ALPHA_FILE &&
(baseColorTextureMapExtension == ".tif" || baseColorTextureMapExtension == ".tiff"))
{
RaiseWarning($"Diffuse texture named {baseColorTexture.Map.FullFilePath} is a .tif file and its Alpha Source is 'Image Alpha' by default.", 3);
RaiseWarning($"If you don't want material to be in BLEND mode, set diffuse texture Alpha Source to 'None (Opaque)'", 3);
}
// Copy base color image
var outTexture = ExportTexture(baseColorTexture, babylonScene);
textureMap[outTexture.Id] = outTexture;
return(outTexture);
}
}
// Otherwise combine base color and alpha textures to a single output texture
RaiseMessage("Export baseColor+Alpha texture", 2);
var hasBaseColor = baseColorTexture != null && isTextureOk(baseColorTexMap);
var hasAlpha = isTextureOk(alphaTexMap);
var texture = hasBaseColor ? baseColorTexture : alphaTexture;
ImageFormat imageFormat = null;
if (hasBaseColor)
{
imageFormat = TextureUtilities.GetImageFormat(Path.GetExtension(baseColorTexture.Map.FullFilePath));
}
if (hasAlpha || imageFormat == null)
{
baseColorTextureMapExtension = ".png"; // since we are adding an alpha channel, export as png. This will convert any other input base texture format to PNG.
imageFormat = ImageFormat.Png;
}
// since we are creating a new texture, give it a unique ID based on the base color and alpha maps.
var nameText = (hasBaseColor ? Path.GetFileNameWithoutExtension(baseColorTexture.Map.FullFilePath) + (hasAlpha ? "_" + Path.GetFileNameWithoutExtension(alphaTexture.Map.FullFilePath) : "") : TextureUtilities.ColorToStringName(baseColor));
var textureID = hasBaseColor ? texture.GetGuid().ToString() + (hasAlpha ? "_" + alphaTexture.GetGuid().ToString() : "") : string.Format("{0}_{1}", texture.GetGuid().ToString(), nameText);
if (textureMap.ContainsKey(textureID))
{
return(textureMap[textureID]);
}
BabylonTexture babylonTexture = null;
babylonTexture = new BabylonTexture(textureID)
{
name = nameText
};
// Alpha
babylonTexture.hasAlpha = hasAlpha || (hasBaseColor && (baseColorTexture.AlphaSource == MaxConstants.IMAGE_ALPHA_FILE || baseColorTexture.AlphaSource == MaxConstants.IMAGE_ALPHA_RGB)) || alpha < 1.0f;
babylonTexture.getAlphaFromRGB = false;
if (!hasBaseColor && !hasAlpha)
{
return(null);
}
if ((!isTextureOk(alphaTexMap) && alpha == 1.0f && (isTextureOk(baseColorTexMap) && baseColorTexture.AlphaSource == MaxConstants.IMAGE_ALPHA_FILE)) &&
(baseColorTextureMapExtension == ".tif" || baseColorTextureMapExtension == ".tiff"))
{
RaiseWarning($"Diffuse texture named {baseColorTexture.Map.FullFilePath} is a .tif file and its Alpha Source is 'Image Alpha' by default.", 3);
RaiseWarning($"If you don't want material to be in BLEND mode, set diffuse texture Alpha Source to 'None (Opaque)'", 3);
}
// Set image format
if (hasAlpha)
{
babylonTexture.name += "_alpha_" + alphaTexture.Name;
}
if (imageFormat == ImageFormat.Jpeg)
{
babylonTexture.name += ".jpg";
}
else
{
babylonTexture.name += "." + imageFormat.ToString();
}
// Level
babylonTexture.level = 1.0f;
// UVs
var uvGen = _exportUV(texture.UVGen, babylonTexture);
// Is cube
_exportIsCube(texture.Map.FullFilePath, babylonTexture, false);
// --- Merge baseColor and alpha maps ---
if (exportParameters.writeTextures && baseColorTexture != alphaTexture && alphaTexture != null)
{
// Load bitmaps
var baseColorBitmap = _loadTexture(baseColorTexMap);
var alphaBitmap = _loadTexture(alphaTexMap);
// Retreive dimensions
int width = 0;
int height = 0;
var haveSameDimensions = TextureUtilities.GetMinimalBitmapDimensions(out width, out height, baseColorBitmap, alphaBitmap);
if (!haveSameDimensions)
{
RaiseError("Base color and transparency color maps should have same dimensions", 3);
}
var getAlphaFromRGB = alphaTexture != null && ((alphaTexture.AlphaSource == MaxConstants.IMAGE_ALPHA_RGB) || (alphaTexture.AlphaSource == MaxConstants.IMAGE_ALPHA_NONE)); // 'RGB intensity' or 'None (Opaque)'
// Create baseColor+alpha map
var _baseColor = Color.FromArgb(
(int)(baseColor[0] * 255),
(int)(baseColor[1] * 255),
(int)(baseColor[2] * 255));
var _alpha = (int)(alpha * 255);
Bitmap baseColorAlphaBitmap = new Bitmap(width, height);
for (int x = 0; x < width; x++)
{
for (int y = 0; y < height; y++)
{
var baseColorAtPixel = baseColorBitmap != null?baseColorBitmap.GetPixel(x, y) : _baseColor;
Color baseColorAlpha;
if (alphaBitmap != null)
{
// Retreive alpha from alpha texture
Color alphaColor = alphaBitmap.GetPixel(x, y);
int alphaAtPixel = getAlphaFromRGB ? alphaColor.R : alphaColor.A;
if (isOpacity == false)
{
// Convert transparency to opacity
alphaAtPixel = 255 - alphaAtPixel;
}
baseColorAlpha = Color.FromArgb(alphaAtPixel, baseColorAtPixel);
}
else if (baseColorTexture != null && baseColorTexture.AlphaSource == MaxConstants.IMAGE_ALPHA_FILE) // Alpha source is 'Image Alpha'
{
// Use all channels from base color
baseColorAlpha = baseColorAtPixel;
}
else
{
// Use RGB channels from base color and default alpha
baseColorAlpha = Color.FromArgb(_alpha, baseColorAtPixel.R, baseColorAtPixel.G, baseColorAtPixel.B);
}
baseColorAlphaBitmap.SetPixel(x, y, baseColorAlpha);
}
}
// Write bitmap
if (isBabylonExported)
{
RaiseMessage($"Texture | write image '{babylonTexture.name}'", 3);
TextureUtilities.SaveBitmap(baseColorAlphaBitmap, babylonScene.OutputPath, babylonTexture.name, imageFormat, exportParameters.txtQuality, this);
}
else
{
// Store created bitmap for further use in gltf export
babylonTexture.bitmap = baseColorAlphaBitmap;
}
}
return(babylonTexture);
}