uniform mat4 uMVPMatrix;
attribute vec4 aVertex;
attribute vec2 aTextureCoord;
uniform vec3 uPosition;
varying vec2 vTextureCoord;

vec4 unit;
vec4 distortedPosition;
float unitLength;
float z;

void main()
{
    unit.x = aVertex.x + uPosition.x;
    unit.y = aVertex.y + uPosition.y;
    unit.z = 2.5;

    unitLength = sqrt((unit.x * unit.x) + (unit.y * unit.y) + (unit.z * unit.z));

    unit.x /= unitLength;
    unit.y /= unitLength;
    unit.z /= unitLength;

    z = aVertex.z + uPosition.z;

    distortedPosition.x = unit.x * (z + 4.0);
    distortedPosition.y = unit.y * (z + 4.0);
    distortedPosition.z = unit.z * (z + 3.0);

    gl_Position = uMVPMatrix * distortedPosition;
    vTextureCoord = aTextureCoord;
}