Hi vikingcode,
Here's the patch to make the collada converter use the vertex colours from a dae file and export it into the tangent stream. This isn't ideal as now you can't use normal mapping and it also limits vertex colours to RGB (no A support here, sorry) but hopefully this helps you (for me the vertex coloured objects don't need normal maps so it is OK at the moment). I added a flag to the converter -vertColorsAsTan to enable this, when disabled it should export like normal.
In your GLSL shader you pretty much just add this to your vertex program:
Code:
attribute vec3 tangent;
varying vec3 vertColor;
void main(void)
{
vertColor = tangent;
}
varying vec3 vertColor;
void main(void)
{
vertColor = tangent;
}
And in your fragment program:
Code:
varying vec3 vertColor;
void main(void)
{
gl_FragColor.rgb = vertColor.rgb;
}
void main(void)
{
gl_FragColor.rgb = vertColor.rgb;
}
Of course you just append that to an existing shader, or do it in another way however you see fit, the important thing is the data is now in the tangent attribute...
Ideally I think horde will move to a more custom way of defining vertex streams in future, I remember Marciano or Volker talking about this but I'm not 100% sure. Hope this helps, or inspires you to make your own implementation (hopefully better than this).
| Attachments: |
colladaconverter_vertcolor_patch.zip [4.3 KiB]
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