I am having a slight problem with my Bump Mapping project. Although everything works OK (at least from what I know) there is a slight mistake somewhere and I get incorrect shading on the brick wall when the light goes to the one side or the other as seen in the picture below:
The light is on the right side so the shading on the wall should be the other way. I have provided the shaders to help find the issue (I do not have much experience with shaders).
Shaders:
varying vec3 viewVec;
varying vec3 position;
varying vec3 lightvec;
attribute vec3 tangent;
attribute vec3 binormal;
uniform vec3 lightpos;
uniform mat4 cameraMat;
void main()
{
gl_TexCoord[0] = gl_MultiTexCoord0;
gl_Position = ftransform();
position = vec3(gl_ModelViewMatrix * gl_Vertex);
lightvec = vec3(cameraMat * vec4(lightpos,1.0)) - position ;
vec3 eyeVec = vec3(gl_ModelViewMatrix * gl_Vertex);
viewVec = normalize(-eyeVec);
}
uniform sampler2D colormap;
uniform sampler2D normalmap;
varying vec3 viewVec;
varying vec3 position;
varying vec3 lightvec;
vec3 vv;
uniform float diffuset;
uniform float specularterm;
uniform float ambientterm;
void main() {
vv=viewVec;
vec3 normals = normalize(texture2D(normalmap,gl_TexCoord[0].st).rgb * 2.0 - 1.0);
normals.y = -normals.y;
//normals = (normals * gl_NormalMatrix).xyz ;
vec3 distance = lightvec;
float dist_number =length(distance);
float final_dist_number = 2.0/pow(dist_number,diffuset);
vec3 light_dir=normalize(lightvec);
vec3 Halfvector = normalize(light_dir+vv);
float angle=max(dot(Halfvector,normals),0.0);
angle= pow(angle,specularterm);
vec3 specular=vec3(angle,angle,angle);
float diffuseterm=max(dot(light_dir,normals),0.0);
vec3 diffuse = diffuseterm * texture2D(colormap,gl_TexCoord[0].st).rgb;
vec3 ambient = ambientterm *texture2D(colormap,gl_TexCoord[0].st).rgb;
vec3 diffusefinal = diffuse * final_dist_number;
vec3 finalcolor=diffusefinal+specular+ambient;
gl_FragColor = vec4(finalcolor, 1.0);
}
