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instant fps drop

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When I pan the camera into a certain place, fps instantly drops from 60 to 27 and stays like that til the program closes. I experimented something and following action makes it happens.

1) enable pixel fog for alpha-blending object and render two or more alpha-blending objects. Those alpha-blending objects have animated texture which is in fact a linked list of .jpg/.png files. And having the number of animation to more than 10 images per linked list causes it too.

2) I just started working on terrains, and having more than 10x10 vertexes will cause to problem too.

Can anyone help?

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Enabling the OpenGL API flags GL_LINE_SMOOTH and GL_POINT_SMOOTH can severely effect your FPS if you have an insane number of points and/or lines rendering. Play around with what you have and see what performance increase/detail decrease you get.

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