Re: strange texture animation behavior

[Lane R. <la...@if...>]

Nanosaur for Windows exhibits this very problem... although I think in
the latest version of Quesa this particular problem may have been solved
for Nano. (other problems replaced it).

At one point I had removed this feature from Nanosaur because of the UV
scrolling problems. Not sure if I ever put it back in actually ...

on Mon, Jun 14, 2004 Keith Wiley may have said:

>I am doing a simple texture "animation" by scrolling the UV coordinates 
>of a texture, exactly as per the Nanosaur public code.  I got it to work 
>without a problem, except there's a problem.  I have a couple models in 
>the world right now.  It's a test world so it's not very interesting, 
>just a place to screw around.  The texture and object in question 
>animate perfectly, a really cheap looking waterfall which I will make 
>fancier when the time comes.  Here's the thing.  Some of the other 
>objects in the world are displaying texture scrolling as well, but yet 
>some other objects aren't.  I didn't want anything to scroll that I 
>don't explicitly designate as such of course.  I can't figure out why 
>some unintended objects and textures are scrolling while others remain 
>normal.
>
>Bear in mind that each of these objects came from a separate 3DMF file 
>with its own texture and basically totally separate from all the other 
>models in every way I can imagine.
>
>What could possibly cause this?  Here's my code.  It's ridiculously 
>simple, because as far as I can tell, scrolling the texture isn't very 
>hard.  (This code is written with the Queeg framework, with necessary 
>accessors added to the associated classes, and the function below is 
>called from the Queeg Update function).
>
>Any help appreciated.  Thanks.
>
>void AnimateWaterfallTexture()
>{
>    TQ3Matrix3x3 uvTransformMatrix;
>    Q3Matrix3x3_SetTranslate(&uvTransformMatrix, gH, gV);
>    gH += 0;
>    gV -= .003;
>   
>    QGTriMesh* triMesh = gWaterfall->GetFirstTriMesh();
>   
>    TQ3TriMeshData triMeshData;
>    triMeshData = triMesh->GetTriMeshData();
>   
>    TQ3SurfaceShaderObject    shader;
>   
>    if (triMeshData.triMeshAttributeSet)
>    {
>        if (Q3AttributeSet_Contains(triMeshData.triMeshAttributeSet, 
>kQ3AttributeTypeSurfaceShader))
>        {
>            Q3AttributeSet_Get(triMeshData.triMeshAttributeSet, 
>kQ3AttributeTypeSurfaceShader, &shader);
>            Q3Shader_SetUVTransform(shader, &uvTransformMatrix);
>            Q3Object_Dispose(shader);
>        }
>    }
>}


=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Lane Roathe, President                          Ideas From the Deep
<mailto:la...@if...>                          <http://www.ifd.com>
___________________________________________________________________
Life is cheap, but the accessories will break you.