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derek7

render to texture

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why render to texture ? the texture is just image the same as backbuffer. the key : it will be map to geometry and THEN make many effect?? Do I guess right?

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Rendering to a texture is usually for effects. I mean, rendering to textures you could create dynamic mirrors (render to texture, then map that texture to geometry and bam, it looks like a mirror), you could do other things too. My mind isn't really with me right now. Long day at work. But they are pretty handy given the right circumstances.

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There are lots of things:
For example you can render the scene to a texture, then apply that texture to an irregular shaped quad. Something like seen in Samuari Jack.

http://www.goldenlands.com/cartoon%20network/samurai_jack/opcs/full%20size/samurai_jack_limited.jpg

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Rendering to texture gives you the advantage of at runtime being able to manipulat e the scene that has just been presented such as creating a realistic reflection effect. Some of the render to texture techniques used are reflection of a scene in water, blurring/distortion of the already rendered scene. The HDR demo's found in the stickies also use the render to texture technique to create a bloom effect.

There are so many applications for Render to Texture and it's really one of the graphics developers best tools.

I hope this helps.
Take care.

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