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This OpenGL sample shows how to draw a plane in 3d using your mouse. Also explains how to transform mouse coordinates to 3d world coordinates. This tutorial shows the connection between 'glulookat' command, mouse position on the screen and 3d world coordinates. This example will get you familiar with the gluunproject perspective projection, ray picking and the use of glreadpixels. Also explains the glulookat implementation, the right mathematical formula to use, the correct matrix projection and gives a connection between these commands. Get full OpenGL source.
How to draw a line using a mouse? How to draw smooth lines on screen using a mouse pointer? How to draw rectangles with exact coordinates in OpenGL? How to draw smooth circles in OpenGL? Glrectangle, GluDisk, Gluquadric commands explained. This example also shows how to save the drawing into a file and how to load OpenGL drawing from a file. Get full source code.
How to select objects in OpenGL? Picking and selecting in OpenGL example. How to click exactly on object, no mater what the gluulookat is? Commands like glupickmatrix, gl_select and gl_render explained.
How to display 3D text in OpenGL based on Windows fonts? How to change dimensions of OpenGL 3D text, how to extrude text and more.
This opengl example shows how to initialize opengl on a certain part of a form. Let's say you want your opengl window to be displayed on a panel and you also want to put other windows components on a form. See how. Full source code.