attribute vec4 vertex;
attribute vec4 normal;
attribute vec4 uv0;
attribute vec4 uv1; // pos2
attribute vec4 uv2; // normal2

varying vec2 oUv;
varying vec4 colour;

uniform mat4 worldViewProj;
uniform vec4 anim_t;
uniform vec4 objSpaceLightPos;
uniform vec4 ambient;

// hardware morph animation (with normals)
void main()
{
	// interpolate position
	vec4 posinterp = vec4(vertex.xyz + anim_t.x*(uv1.xyz - vertex.xyz), 1.0);

    // nlerp normal
	vec3 ninterp = normal.xyz + anim_t.x*(uv2.xyz - normal.xyz);
	ninterp = normalize(ninterp);

	gl_Position = worldViewProj * posinterp;
	oUv = uv0.xy;

	vec3 lightDir = normalize(
		objSpaceLightPos.xyz - (posinterp.xyz * objSpaceLightPos.w));

	// Colour it red to make it easy to identify
	float lit = clamp(dot(lightDir, ninterp), 0.0, 1.0);
	colour = vec4((ambient.rgb + vec3(lit,lit,lit)) * vec3(1.0,0.0,0.0), 1.0);
}