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render certain objects to texture/file

Started by ehmdjii Aug 1, 2007 at 8:48 AM 5 replies 700+ views

Original Post

148

Aug 1, 2007 at 8:48 AM

hello, i would like to implement a feature to my game, that allows players to save a screenshot just of their character without the environment. so i thought of just rendering the character-node of the scenegraph and writing that to a file (PNG). how could i do that? thanks!

zedz

144

zedz

Aug 2, 2007 at 2:38 AM

if ( takescreenshot )
{
glClear( GL_COLORBUFFER );
draw player
readpixels + save to file
}

_neutrin0_

Aug 2, 2007 at 2:59 AM

Or, you could render your character directly to a texture using an Frame buffer object (FBO) or Pixel Buffers. Then save the texture to a file using glGetTexImage on the rendered texture.

I would recommend using FBOs.

Promit

Mod

1,082

Promit

Aug 2, 2007 at 3:17 AM

You'll lose antialiasing on the result image if you use FBOs. Using ReadPixels is probably the most reliable way to go about it.

ehmdjii

Author

148

ehmdjii

Aug 2, 2007 at 7:04 AM

thanks everyone!

why would i loose antialiasing? cant i setup an RGBA texture to render to?

Ingrater

Aug 2, 2007 at 7:08 AM

Antialiasing is not supported for fbo's on current hardware except the new gf8 and and (don't know exactly) atis 2000 series. If you stick to readpixels from the framebuffer you can use antialiasing.

Structural

Aug 2, 2007 at 7:40 AM

And I would like to add that not all hardware supports FBOs (such as cheap Intel chips).

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