attribute vec3 pos;
attribute vec2 texcoord;
attribute vec3 normal;

uniform mat4 M;
uniform mat4 P;
uniform mat4 V;
uniform mat4 NM;//Normal Matrix 使用来修正法线的

varying vec3 V_Normal;
varying vec3 V_WorldPos;
void main()
{
	V_Normal = mat3(NM)*normal;
	vec4 worldPos = M * vec4(pos, 1.0);
	V_WorldPos = worldPos.xyz;

	gl_Position=P*V*M*vec4(pos,1.0);
}