uudet valot

src/shaders/fragment.frag

@@ -116,6 +116,10 @@ vec2 opU(vec2 d1, vec2 d2) {
     return (d1.x < d2.x) ? d1 : d2;
 }
 
+float sdSphere(vec3 p, float r){
+    return length(p) -r;
+}
+
 vec2 mapScene(in vec3 p) {
 
     float res = p.y;
@@ -138,9 +142,33 @@ vec2 mapScene(in vec3 p) {
 
     //float d1 = hexPylon(vec3(r.x, (r.y + hexHeight / 2), r.z), vec2(hexRadius, hexHeight / 2));
     float d1 = hexPylon(vec3(r.x, r.y, r.z), vec2(hexRadius, hexHeight + 5));
-
     res = (d1 < res) ? d1 : res;
 
+
+    // DEBUGGING --- LIGHT CHANGING WITH CIRCLE RADIUS
+    float maxRadius = 15.;     // Circle radius
+    float particleHeight = 5. + (syncs[5] * 40.);
+    float particlePos = (syncs[0] * 0.5) + syncs[5];
+    
+    // Map param to angle
+    float particleStartPos = particlePos * 2.0 * PI;
+         
+    // Direction from center to initial circle position (in XY plane)
+    vec3 particleDir = normalize(vec3(cos(particleStartPos), 0.0, sin(particleStartPos))); // XZ direction
+
+    float rad = max(maxRadius - syncs[5], maxRadius);
+
+    vec3 particleOffset = vec3(0. , particleHeight, 0.); // particle offset
+
+    // Final object position = center (offset) + radial movement
+    vec3 center = particleOffset;           // Circle center
+    vec3 objPos = center + particleDir * rad;         // Object slides inward
+    //res = opU(res, vec2(sdSphere(p - objPos, sphereRadius), 1.));
+    d1 = sdSphere(p - objPos, 1.);
+    //res = opU(res, vec2(sdSphere(p - objPos, 0.4), 1.));
+    //res = (d1 < res) ? d1 : res;
+
+
     return vec2(res, mat);
 }
 
@@ -177,26 +205,51 @@ vec3 castRay(vec3 ro, vec3 rd, inout vec3 pos) {
 ////////////////
 //   SHADING  //
 ////////////////
-vec3 phongLighting(vec3 p, vec3 normal, vec3 lightPos, vec3 viewPos, vec3 lightColor, vec3 objectColor) {
-    vec3 lightDir = normalize(lightPos - p);
-    vec3 viewDir = normalize(viewPos - p);
-    vec3 reflectDir = reflect(-lightDir, normal);
+float softshadow(in vec3 ro, in vec3 rd, float mint, float maxt, float w) {
+    float res = 1.0;
+    float t = mint;
+    for(int i = 0; i < 6; i++) {
+        if(t > maxt)
+            break;
+        float h = mapScene(ro + t * rd).x;
+        res = min(res, h / (w * t));
+        t += clamp(h, 0.1, 0.80);
+        if(res < -1.0)
+            break;
+    }
+    res = max(res, -1.0);
+    return 0.25 * (1.0 + res) * (1.0 + res) * (2.0 - res);
+}
 
-    // Ambient
-    float ambientStrength = 0.1;
-    vec3 ambient = ambientStrength * lightColor;
+vec3 addPointLight(vec3 lightPos, vec3 lightColor, float intensity, vec3 worldPos, vec3 viewDir, vec3 normal) {
+    // Light vector from surface to light
+    float roughness = 1.0;
+    vec3 lightDir = lightPos - worldPos;
+    float lightDistance = length(lightDir);
+    lightDir = normalize(lightDir);
 
-    // Diffuse
-    float diff = max(dot(normal, lightDir), 0.0);
-    vec3 diffuse = diff * lightColor;
+    // Attenuation (quadratic falloff)
+    float attenuation = intensity / (1.0 + 0.09 * lightDistance + 0.032 * lightDistance * lightDistance);
 
-    // Specular
-    float specularStrength = 13.5;
-    float spec = pow(max(dot(viewDir, reflectDir), 0.0), 32.0); // shininess
-    vec3 specular = specularStrength * spec * lightColor;
+    // Diffuse lighting (Lambert)
+    float NdotL = max(dot(normal, lightDir), 0.0);
+    vec3 diffuse = lightColor * NdotL * attenuation;
 
-    // Combine
-    return (ambient + diffuse + specular) * objectColor;
+    // Specular lighting (Blinn-Phong)
+    vec3 halfDir = normalize(lightDir + (-viewDir));
+    float NdotH = max(dot(normal, halfDir), 0.0);
+    float shininess = mix(128.0, 8.0, roughness); // Convert roughness to shininess
+    vec3 specular = lightColor * pow(NdotH, shininess) * attenuation;
+
+    // Fresnel effect
+    vec3 F0 = vec3(0.04); // Base reflectance for dielectrics
+    vec3 fresnel = F0 + (1.0 - F0) * pow(clamp(1.0 - max(dot(halfDir, lightDir), 0.0), 0.0, 1.0), 5.0);
+
+    // Soft shadows
+    float shadow = softshadow(worldPos + normal * 0.01, lightDir, 0.02, lightDistance, 4.0);
+
+    // Combine diffuse and specular with shadow
+    return (diffuse + specular * fresnel) * shadow * shadow;
 }
 
 vec3 calcNormal(vec3 pos) {
@@ -236,7 +289,29 @@ vec3 shading(vec3 p, vec3 n, vec3 dir, vec3 camPos) {
 
     vec3 lights = vec3(0.);
     //lights += phongLighting(p, n, camPos, dir, vec3(0.51), outMaterial);
-    lights += phongLighting(p, n, vec3(4., 4., -4.), dir, vec3(2.51), outMaterial);
+    lights += addPointLight(vec3(0., 20.0, 0.), vec3(0.77, 0.26, 0.73), 30.0, p, dir, n);
+
+    // LIGHT CHANGING WITH CIRCLE RADIUS
+    float maxRadius = 25.;     // Circle radius
+    float particleHeight = 15.; //(syncs[5] * 40.);
+    float particlePos = (syncs[0] * 0.5) + syncs[5];
+    
+    // Map param to angle
+    float particleStartPos = particlePos * 2.0 * PI;
+         
+    // Direction from center to initial circle position (in XY plane)
+    vec3 particleDir = normalize(vec3(cos(particleStartPos), 0.0, sin(particleStartPos))); // XZ direction
+
+    float r = max(maxRadius - 0.0, maxRadius);
+
+    vec3 particleOffset = vec3(0. , particleHeight, 0.); // particle offset
+
+    // Final object position = center (offset) + radial movement
+    vec3 center = particleOffset;           // Circle center
+    vec3 objPos = center + particleDir * r;         // Object slides inward
+    //res = opU(res, vec2(sdSphere(p - objPos, sphereRadius), 1.));
+
+    lights += addPointLight(objPos, vec3(0.33, 0.91, 0.93), 30.0, p, dir, n);
 
     vec3 lightDir = vec3(0., 2., 3);