Hi guys, I'm really new to OpenGL, which is a really bad thing to me :| I need to draw a star(sort of) with openGl but I'm not really sure where I should start.
The results should be something like this: http://i29.tinypic.com/68zif8.gif Is there an easy way to do this ?
Thank you !
Hi, the easiest way would be to draw a texture mapped quad with a "star" texture. You can read a tutorial on texture mapping here: http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=06
That tutorial teaches how to draw a cube using textures. You just have to draw a single face, instead of all six.
The tutorial is written in C++, but near the end you can download the source of a Delphi version.
There are other effects you might want to add later, such as transparency. You can also read about that in the NeHe site. It has a lot of useful tutorials on OpenGL. It's a great place to learn OpenGL.
If you're new to OpenGL and if you're using Delphi, then most probably what you need is GLScene. Mature, alive, very good quality of code and, of course, free.
Why not write an algorithm to generate a texture procedurally in code using a 2D GLuByte array as in the "checker.c" example in Redbook? Instead of following a perfect checkerboard pattern, figure out how to make a 2D texture of that star and map it into a quad using glTexImage2D(...).
