Texture that always faces to the viewer?

[Diapolo]

I´m talking about these 2D textures, that spin with, if you move arround them, so that you allways see the front of it.
Many games use it and I want to use it for a particle system ... but I dunno how this technique is called and how I can code this in OpenGL?

Regards,
Diapolo

[DFrey]

That method is called billboarding. Search the forum for billboards and you should find what you are looking for.

[This message has been edited by DFrey (edited 05-03-2001).]

[Humus]

Try this:


float mat[16];
glGetFloatv(GL_MODELVIEW_MATRIX, mat);


Your "Up" vector (mat[0],mat[4],mat[8])
Your "Right" vector (mat[1],mat[5],mat[9])

Use those to compase a quad and you're done. http://www.opengl.org/discussion_boards/ubb/smile.gif

[rIO]

Look also on NAte Miller's web site for some implementation sample.


rIO.sK http://www.spinningkids.org/umine