W is the fourth coordinate of a three dimensional vertex; This vertex is called homogeneous vertex coordinate. In few words, the W component is a factor which divides the other vector components. When W is 1.0, the homogeneous vertex coordinates are “normalized”. To compare two vertices, you should normalize the W value to 1.0. Think … Read more
The state of which Vertex Attribute Arrays are enabled can be either bound to a Vertex Array Object (VAO), or be global. If you’re using VAOs, then you should not disable attribute arrays, as they are encapsulated in the VAO. However for global vertex attribute array enabled state you should disable them, because if they’re … Read more
A fragment shader is the same as pixel shader. One main difference is that a vertex shader can manipulate the attributes of vertices. which are the corner points of your polygons. The fragment shader on the other hand takes care of how the pixels between the vertices look. They are interpolated between the defined vertices … Read more