WebGL: Prevent color buffer from being cleared
Even if I remove
gl.clearColor(c[0],c[1],c[2],1.0);
gl.clear(gl.COLOR_BUFFER_BIT );
the screen still gets cleared at the beginning of the next draw cycle. Is there a way to prevent this. I´d like to achive some kind of overpaint effect.
When you create your WebGLRenderingContext you can tell it to preserve the drawing buffer.
gl = someCanvas.getContext("webgl", { preserveDrawingBuffer: true });
The default is preserveDrawingBuffer: false because it's faster in some cases.