C and Cpp Graphics Getting started with OpenGL Tutorial

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Tutorial: C and Cpp Graphics Getting started with OpenGL Tutorial

Getting started with OpenGL; The first OpenGL program.

Tutorial Details:

Getting started with OpenGL

In this lesson I shall introduce several functions and show you actual OpenGL rendering in a program. Prior to showing you the code, however, I want to go over a few things with you. This will give you a better understanding of what is going on when you do see the code, so you don't stare at the screen wondering what you're looking at. So, on with the show.

Transformations in OpenGL rely on the matrix for all mathematical computations. No, not the movie. Concentrate grasshopper. OpenGL has what is known as a matrix stack, which comes in handy for constructing models composed of many simple objects.

The modelview matrix defines the coordinate system that is being used to place and orient objects. It is a 4x4 matrix that is multiplied by vertices and transformations to create a new matrix that reflects the result of any transformations that have been applied to the vertices. When we want to modify the modelview matrix we use the command glMatrixMode(). We define this as

void glMatrixMode(GLenum mode);
Before you call any transformation commands you MUST specify whether you want to modify the modelview matrix or the projection matrix. The argument for modifying the modelview matrix is GL_MODELVIEW. So the complete line would appear as:

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