A quick update on the lighting code I’ve been working on. Now that I have normal maps and per-pixel bump mapping working, I can turn these:
Into this:
Check out how the ship appears lit from each side. It looks even better as you see it moving. Hey presto: a realistic 3D effect with only two triangles rendered.
All I’m using is this simple GLSL fragment shader:
void main() {
vec4 color = texture(baseTexture, uv);
vFragColor = vertColor * color;
float alpha = vFragColor.a;
if (alpha > 0.0 && useNormal) {
vec3 lightDirection = normalize(vec3(0.2, 0.2, 0.0));
vec4 normal = normalize(texture(normalTexture, uv) * 2.0 - 1.0);
vec4 vEyeNormal = normalMatrix * normal;
float diffuse = max(0.0, dot(vEyeNormal.xyz, lightDirection));
vFragColor *= (diffuse * 3);
vFragColor.a = alpha;
}
}GLSL is great.