Draw to texture

[keenanwoodall]

Hello! I am new to nannou and am really enjoying it. Thank you for creating such an excellent toolkit!
One thing I'm finding that I often want to do is to draw directly to a texture. Is this possible? I have struggled to find a beginner-friendly way to do this.

For example, I'm currently trying to draw long-lasting trails that follow the bob of a pendulum. I'd like to avoid storing an ever-growing vector of points that is redrawn every frame via a polyline. Instead, for every frame, I'd like to draw the newest segment of the trail to a texture that is never cleared. I could then draw the actual pendulum (which will be cleared) on top of the texture. This would allow me to have a performant trail that doesn't get more expensive to render the longer the program runs, and I could even accumulate cool image operations like a blur - how exciting!

I imagine this is already possible? Apologies if I've missed it somehow, but I'd appreciate being pointed in the right direction if it is!