25.05.2002
Blending is used to combine the color of a given pixel that is about to be drawn with the pixel that is already on the screen.
Blending is setting through:
glEnable(GL_BLEND); and glDisable(GL_BLEND);
The Blending Equation is set:
glBlendFunc( source factor, destination factor );
25.05.2002
Multi-texturing – the ability to apply two or more distinct textures to a single fragment. I use two texture units. Each texture unit has its own texture coordinates.
Multi-texture makes it possible to use light-map in one pass. Many OpenGL games such as Quake and Unreal use light maps to improve the lighting quality within their scenes. Multi-texture is often uses on bump-mapping.
Request: GL_ARB_multitexture and GL_ARB_texture_env_add.
21.04.2002
Height map is picture, that intensity of color represent height of terrain.
09.01.2002
Program draws:
cylinder, cone, sphere, one-part rotated hyperboloid, anuloid, rotated elipsoid, rotated paraboloid, rotated function sinus and rotated Bezier curve.
All surfaces has textures, are lighting and are animate.
05.01.2002
Program draws:
Bezier curves, Circle, Ellipse, Parabole, Hyperbola, Ortocykloida, Epicykloida, Hypocykloida, Evolvent of circle, Lemniskat of Bernoulli, Descartes leaf, and Archimedes spiral.
05.01.2002
All these objecs draw by glu (OpenGL Utility library).
05.01.2002
For lighting are important vectors to perpendicular on surfaces (normal vectors). These vectors are use to compute lighting.
Program draws cube two ways:
First cube (at left) has one normal vector on side.
Second cube (at right) has one normal vector on vertex.
05.01.2002
Press key ‘h’ to show help. This goes for all further programs.
