Even without a fix, can anyone possibly take the time to confirm that this is happening on their mid 2010 macbooks...i would just like to know if its my machine/settings or if its a general shader problem with these newer graphics cards

I tried running the opengl profiler for a frame with wobble turned on, but most of the processes looked normal as far as i could tell..the getGLerror was always gl_zero (if thats anything)

I also tried compiling the shader in the shader builder but i think something might be different with how it gets passed images or something..I ended up getting the same black image

can you post a test patch?

I will post the shader code I have below as well. My guess is maybe something is getting screwed up with the light position, but I don't have any evidence.

Shader, just in case everyone else's is different from mine:

Shader for wobbling a texture

I am also getting only a black screen when using your test patch. I am using a MBP 10.6.4 NVIDIA GeForce GT 330M

Thanks a lot, good to know I'm not crazy. I have that exact same setup as well. I've just exhausted all of my resources for trying to figure out how to fix it..maybe some shader wizard will come along...

i'm not sure why, but the clamp function is acting weird on nvidia cards with this particular shader. try replacingfloat spec = clamp(dot(reflectVec, viewVec), 0.0, 1.0); withfloat spec = max(dot(reflectVec, viewVec), 0.0);

if anyone has insight into this, i'd love to hear it.

That did it, thanks a lot!

I was going to ask you how you debugged that, but had you just heard about it 'around town' or something? I'm trying to get a little more self sufficient for figuring out these open gl issues

debugging shaders is tricky. really, the only way to do it is with gl_FragColor output value. you can set this equal to different variables from the different stages of the shader.

for example the first thing i did was set the varying lightintensity equal to the spec value in the vertex shader. then is i set gl_FragColor = vec4(lightintensity, lightintensity, lightintensity,1.0) and determined that the spec value was 0 (because the output was black).

however changing "clamp" to "max" was just a lucky guess. i still have no idea why clamp was not working.

using a slightly different approach: using the original shader, turning the light on and calling a shader directly in the video plane.