shadows everywhere! lights must be moved elsewhere

res/shaders/simple.frag

@@ -6,6 +6,7 @@ in layout(location = 2) vec3 worldPositions;
 
 uniform vec3 lightPositions[3];
 uniform vec3 cameraPosition;
+uniform vec3 ballPosition;
 
 out vec4 color;
 
@@ -15,6 +16,9 @@ float rand(vec2 co) {
 float dither(vec2 uv) {
     return (rand(uv) * 2.0 - 1.0) / 256.0;
 }
+vec3 reject(vec3 from, vec3 onto) {
+    return from - onto * dot(from, onto) / dot(onto, onto);
+}
 
 const vec3 objectColor = vec3(1.0, 1.0, 1.0);
 const vec3 lightColor = vec3(0.5, 0.5, 0.5);
@@ -25,6 +29,8 @@ const float shininess = 32.0;
 
 const float la = 0.1, lb = 0.01, lc = 0.001;
 
+const float ballRadius = 1.0;
+
 void main()
 {
     vec3 norm = normalize(normal);
@@ -36,8 +42,12 @@ void main()
     for (int i = 0; i < 3; i++) {
         vec3 lightVector = lightPositions[i] - worldPositions;
         vec3 lightDir = normalize(lightVector);
+
+        vec3 fragToBall = lightPositions[i] - ballPosition;
+
         float d = length(lightVector);
         float attenuation = 1.0 / (la + d * lb + d * d * lc);
+
         float diff = max(dot(norm, lightDir), 0.0);
         vec3 diffuse = diff * lightColor;
 
@@ -45,7 +55,8 @@ void main()
         float spec = pow(max(dot(norm, halfwayDir), 0.0), shininess);
         vec3 specular = specularStrength * spec * lightColor;
 
-        result += attenuation * (diffuse + specular) * objectColor;
+        if (length(lightVector) < length(fragToBall) && dot(lightVector, fragToBall) < 0.0)
+            result += attenuation * (diffuse + specular) * objectColor;
     }
 
     color = vec4(result + dither(textureCoordinates), 1.0);

src/gamelogic.cpp

@@ -409,6 +409,8 @@ void renderNode(SceneNode* node) {
     GLint cameraPosLoc = shader->getUniformFromName("cameraPosition");
     glUniform3fv(cameraPosLoc, 1, glm::value_ptr(cameraPosition));
 
+    GLint ballPosLoc = shader->getUniformFromName("ballPosition");
+    glUniform3fv(ballPosLoc, 1, glm::value_ptr(ballPosition));
 
     switch(node->nodeType) {
         case GEOMETRY: