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October 17th, 2013, 07:33 AM
#1
Emulate shutter in OpenGL
I want to emulate shutter time with OpenGL. I found this below gives the best results:
ClearScene();
DrawScene();
DrawMovingObject();
glAccum(GL_LOAD, 1.0/n );
for (i=1; i<n; i++)
{
ClearScene();
DrawScene();
DrawMovingObject();
glAccum(GL_ACCUM, 1.0/n );
}
glAccum(GL_RETURN, 1.0);
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)?
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۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞
۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞
۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞۞
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