Android OpenGL ES 2.0 plotting: Application projection and camera view

In the OpenGL ES environment, the projection and camera views show objects closer to what people see with the naked eye. This simulation technology is achieved by precisely performing mathematical transformations on the coordinates of the drawn objects.

Projection: this transformation adjusts the coordinates of the drawn object based on the width and height of the GLSurfaceView.

Without this transformation, the object will be distorted by views with irregular proportions.

Generally, a projection transformation is calculated only when the onSurfaceChange () method of the OpenGLView or your renderer class is changed,