1. Not all graphics hardware supports Sampler2D input to a vertex shader
Crashing probably isn't the Right Thing to do in this case though :) A simple "Not Supported" log message would suffice :) That said, I don't think this cause is the problem he's running into, since, as you mention, it works with still images.
2. There's a but in QC that means only still images can be input to a vertex shader.
This isn't quite accurate. You can have animating images (Plasma and Flame Image, for example, work perfectly 100%) that work. Similarly, you can have a still image that gets statically filtered (through a Gaussian Blur, for example) and it'll crash it Guaranteed, even though it's not 'moving'. So it looks like it's more of a GL/Core Image bug than a moving image bug. Semantics, I know :)
There is a more universally-compatible way of doing something similar, using something called VBOs (Vertex Buffer Objects), but I'm not sure that method can be implemented in GLSL. You'd probably have to write a custom QC plugin using OpenGL commands.
This would work. Unfortunately, you lose the possibility of having the displacement take place in hardware though (which might end up be expensive for complex models)... but maybe I'm mistaken on this point? I'm pretty new to shaders.
-- [ christopher wright ] [EMAIL PROTECTED] http://softpixel.com/~cwright/ _______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
