Deforming objects with a vertex shader

A vertex shader processes each vertex of drawing objects and can change their built-in attributes such as position, color, normal, and can also change any custom attributes. Here, we consider the example of the vertex shader that just moves vertices according to a rule with the help of parameters that are controlled by the mouse position.

Note

This is example 08-Shaders/06-VertexDeformation.

This example is based on the example given in the The triangles cloud example section of Chapter 2, Drawing in 3D. The original example draws a rotated sphere-shaped cloud of random triangles.

Vertex shader

In the bin/data folder, create a new text file shaderVert.c containing the following code:

#version 120
#extension GL_ARB_texture_rectangle : enable
#extension GL_EXT_gpu_shader4 : enable

uniform float phase = 0.0;  //Phase for "sin" function
uniform float distortAmount = 0.25; //Amount of distortion

void main() {
  //Get original position of the vertex
  vec3 v...