Adding time to a shader

[JohnPiwinski]

I apologize if my question is rather basic. How can I pass a time variable to a shader in your library? I was looking at modifying the Mandlebrot example to display this complex function plotter.

complex_numbers.rs.txt
shader.frag.txt

I'm not sure what I should name the time variable. In Shadertoy it was called iTime. Is there a corresponding name in three-d?

Thank you so much

[asny]

No problem. Simply define it in the shader and use the Program::use_uniform to send it to the shader each frame. It would probably be simpler if the Mandelbrot example didn't use a material (similar to the triangle_core example) but just send the uniform value in the MandelbrotMaterial::use_uniforms. You can either compute the time in that material or pass it in somehow to the material from the frame input. The name of the uniform is completely up to you.