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How to create multi textured terrain in OpenGL?
The method accepts the name of the file that contains the height map as well as the bit-depth (8-bit, 16-bit, or 32-bit) of the height map texture and the width and height of the texture in pixels.
How do you get texture for height in OpenGL?
For each pixel of the height map we will first get the height value from the height map data and convert it to the range [0…1] using the GetHeightValue method described earlier. The texture coordinate for the terrain will range from (0,0) in the top-left corner to (1,1) in the bottom right corner.
How is terrain rendering used in 3D games?
Terrain rendering is a common task for game programmers. Almost every 3D based game uses some form of terrain rendering in their game. It is the task of the programmer to try to develop a way to simulate a natural looking terrain in an efficient manner.
Which is the best OpenGL library to use?
OpenGL Mathmatics Library (GLM): Used for vector classes, quaternion classes, matrix classes and math operations that are suited for OpenGL applications. Simple OpenGL Image Library (SOIL): A library that provides functions to load textures from disc as easy as possible. This library is ideal for loading images to be used by OpenGL.
When to use texture stage 0 or 2?
Valid values are between 0 and 2 for the 3 possible texture stages. Texture stage 0 is used for the lowest points of the terrain while texture stage 2 is used for the highest points in the terrain. Texture stage 1 is blended between these two elevations depending on the blending method used (height based blending or slope based blending).
How is the height of a grid determined in OpenGL?
The color value of each bit is used to determine the height value of each grid location; in this case, for a 24-bit grayscale bitmap, the values for the color range from 0 to 255. Once the bitmap has been read and the values loaded in memory, we have the data needed to represent the terrain.