Is this possible, a combination of 2D and 3D art - I am thinking of doing this but I wonder if it kills performance or is basically impossible, consumes too much memory or whatever?
Hi
I do that in TUER, I update the texture data in the introduction scene, when my continent becomes entirely red. I advise you not to do so or it will be slow on Intel GPUs, rather use several textures.
I was thinking of loading a sheet of texture frames into memory and then using texture coordinates to cycle through the animation. It would mean a large master texture image.
Why not but you could use better images by using separate textures. You have to find the best trade-off. If you want to support low end hardware and especially smartphones, the maximum texture size will be quite small.
Easy with a small vertex shader. Just send in a frame index, calculate the offsets and set it as the texture coordinates.