what is setTexCoordArray

最新推荐文章于 2025-04-06 14:54:31 发布

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本文详细解释了纹理坐标在OpenGL中的基本概念及其在几何体上的应用方式，包括如何为每个顶点设置2D坐标来关联纹理点和顶点，以及如何通过设置纹理坐标数组来实现纹理的正确映射。

Texture coordinates is a basic way to apply a texture on a geometry.
For each vertex, you give a 2D coordinate data to associate a vertex and a
texture point. OpenGl will interpolate the texture pixel between each
vertex, depending on theses coordinates.

The 2D texture coordinate have to be like this in your texture image:

[0,0]        [1,0]
  |------------|
  |            |
  |            |
  |            |
  |            |
  |------------|
[0,1]        [1,1]


In your example, with a single file of texture, you set the texture for each
side.
For each texture you set in OSG, you can set a texCoordinateArray.
The index you set  pyramidGeometry->setTexCoordArray(*0*,texcoords);
correspond to the texture index you set before, when setting the texture.

Have a look on Texture coordinate on the web, you'll find a lot of
explanations.