VolumeRendering
3D Texture Data
← 3D Texture Objects | ● | 3D Texture Example →
If a 3D texture object has been bound, the data of the texture is uploaded as follows:
glPixelStorei(GL_UNPACK_ALIGNMENT,1);
glTexImage3D(GL_TEXTURE_3D, // 3D texture
0, // level 0 (for mipmapping)
GL_INTENSITY, // pixel format of texture
width,height,depth, // texture size
0, // border size 0
GL_LUMINANCE, // pixel format of data supplied
GL_UNSIGNED_BYTE, // pixel storage type of data supplied
volume); // pointer to data chunk
glTexImage3D(GL_TEXTURE_3D, // 3D texture
0, // level 0 (for mipmapping)
GL_INTENSITY, // pixel format of texture
width,height,depth, // texture size
0, // border size 0
GL_LUMINANCE, // pixel format of data supplied
GL_UNSIGNED_BYTE, // pixel storage type of data supplied
volume); // pointer to data chunk
| pixel format | components |
|---|---|
| GL_INTENSITY | 1 |
| GL_RGB | 3 |
| GL_RGBA | 4 |
| GL_ALPHA | 1 |
| GL_LUMINANCE | 1 |
| GL_LUMINANCE_ALPHA | 2 |
The size of a 3D texture is recommended to be a power of 2!
Simple luminance texture volume with a black and a white slice:
unsigned char volume[2*2*2]={0,0,0,0,
255,255,255,255};
255,255,255,255};
← 3D Texture Objects | ● | 3D Texture Example →