niki

i am trying to write a cg vertex shader for jitter which only changes the positions of the vertices (i am new to shaders). the jit.gl.sketch (plane) should have a texture and a color.

i can move the plane, but the texture is missing. 

---------------------------------------------------------

-----------------------------------------------------------------

i am trying to write a cg vertex shader for jitter which only changes the positions of the vertices (i am new to shaders). the jit.gl.sketch (plane) should have a texture and a color.
i can move the plane, but the texture is missing. 
any ideas, what i am doing wrong ?
thanks a lot in advance
niki

-----------------------------------------------------------------


jitter-vertex-shader-in-cg

first you have to use samplerRECT and texRECT if you are using a rectangular texture (the default for jit.gl.texture).

second, you didn't bind your tex sampler in the fragment program (must be declared and bound as param in jxs headers).

last, if you want a meaningful texture pass thru, you need to multiply your texcoords in the vertex shader by the TEXTURE_MATRIX.

also, it appears you need to @texture attribute in gl.sketch. not sure why that is. might be easier to start off with gl.gridshape.

i fixed a few problems with your cg.
first you have to use samplerRECT and texRECT if you are using a rectangular texture (the default for jit.gl.texture).
second, you didn't bind your tex sampler in the fragment program (must be declared and bound as param in jxs headers).
last, if you want a meaningful texture pass thru, you need to multiply your texcoords in the vertex shader by the TEXTURE_MATRIX.

also, it appears you need to @texture attribute in gl.sketch. not sure why that is.  might be easier to start off with gl.gridshape.

thank you very much, that helped a lot !


jitter vertex shader in cg