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I've noticed some DP demos have a blur on moving objects.
It looks cool, but what causes the effect?

The motion blur effect is caused by a combination of turning off the backdrop (BACKDROP OFF - tells DBPro to stop clearing the screen, which would usually leave a big repeating mess behind when objects move around the screen) and by creating a 'skybox' with a semi-transparent material. The 'skybox' in the case of the demos is a textured sphere.

The reason this works is because the semi-transparent 'skybox' erases a certain amount of the leftover graphics from the previous frames, but not all of it. So after a number of frames it will succeed in erasing everything and this results in a motion blur effect.

Does that make sense? To get a better idea of what's happening, try messing around with the alpha transparency percentage of the object. I would assume that setting it to be ALMOST completely transparent would mean it would take a lot longer to erase the previous frames, and vice versa.

Hope it helps.



Best regards,
-=VRMan=-

Thanks, VRMan.
You are correct about the settings. Seems like the effect ought
to be good in a game.

Wow, that's a nice effect. So simple to implement as well. Particles would look awesome. I never saw that demo.

The alpha mapping costs around 45 fps (405-360) on my system. That is an excellent option to have in a game.

Thanks guys!