Emulate shutter in OpenGL
I want to emulate shutter time with OpenGL. I found this below gives the best results:
glAccum(GL_LOAD, 1.0/n );
for (i=1; i<n; i++)
glAccum(GL_ACCUM, 1.0/n );
However, this code is pretty slow as the entire scene needs to be drawn every single time. If I omit the ClearScene() and DrawScene() part from the for loop, I get a motion blurring effect that however does not look like the effect of a shutter on a camera that I would like to obtain. Any ideas on how to do this faster (copying frame buffer, how)?