When I use my shaders I get following results:
One problem is that specular light is sort of deformed and you could see sphere triangles, another is, that I can see specular where I shouldn't (second image). One spehere light is done in vertex shader, other in fragment.
Here is how my vertex light shader looks like: Vertex:
// Material data.
uniform vec3 uAmbient;
uniform vec3 uDiffuse;
uniform vec3 uSpecular;
uniform float uSpecIntensity;
uniform float uTransparency;
uniform mat4 uWVP;
uniform mat3 uN;
uniform vec3 uSunPos;
uniform vec3 uEyePos;
attribute vec4 attrPos;
attribute vec3 attrNorm;
varying vec4 varColor;
void main(void)
{
vec3 N = uN * attrNorm;
vec3 L = normalize(uSunPos);
vec3 H = normalize(L + uEyePos);
float df = max(0.0, dot(N, L));
float sf = max(0.0, dot(N, H));
sf = pow(sf, uSpecIntensity);
vec3 col = uAmbient + uDiffuse * df + uSpecular * sf;
varColor = vec4(col, uTransparency);
gl_Position = uWVP * attrPos;
}
Fragment:
varying vec4 varColor;
void main(void)
{
//vec4 col = texture2D(texture_0, varTexCoords);
//col.r += uLightDir.x;
//col.rgb = vec3(pow(gl_FragCoord.z, 64));
gl_FragColor = varColor;
}
It is possible, that my supplied data from code is wrong. uN is world matrix (not inverted and not transposed, even though doing that didn't seem to do anything different). UWVP - world view projection matrix.
Any ideas, as to where the problem might be, would be appreciated.
[EDIT] Here is my light calculations done in fragment: Vertex shader file:
uniform mat4 uWVP;
uniform mat3 uN;
attribute vec4 attrPos;
attribute vec3 attrNorm;
varying vec3 varEyeNormal;
void main(void)
{
varEyeNormal = uN * attrNorm;
gl_Position = uWVP * attrPos;
}
Fragment shader file:
// Material data.
uniform vec3 uAmbient;
uniform vec3 uDiffuse;
uniform vec3 uSpecular;
uniform float uSpecIntensity;
uniform float uTransparency;
uniform vec3 uSunPos;
uniform vec3 uEyePos;
varying vec3 varEyeNormal;
void main(void)
{
vec3 N = varEyeNormal;
vec3 L = normalize(uSunPos);
vec3 H = normalize(L + uEyePos);
float df = max(0.0, dot(N, L));
float sf = max(0.0, dot(N, H));
sf = pow(sf, uSpecIntensity);
vec3 col = uAmbient + uDiffuse * df + uSpecular * sf;
gl_FragColor = vec4(col, uTransparency);
}
[EDIT2] As Joakim pointed out, I wasn't normalizing varEyeNormal in fragment shader. After fixing that, the result is much better in fragment shader. I also used normalize function on uEyePos, so specular no longer goes to dark side. Thanks for all the help.
