Added procedural marble based on perlin noise

pjorquera · Mar 14, 2024 · b1be90b · b1be90b
1 parent 837d356
commit b1be90b
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Showing 3 changed files with 18 additions and 1 deletion.
diff --git a/src/perlin.cpp b/src/perlin.cpp
@@ -85,3 +85,17 @@ double Perlin::noise(const Point& point) const {
 
     return interpolation(c, u, v, w);
 }
+
+double Perlin::turbulence(const Point& p, int depth) const {
+    auto accum = 0.0;
+    auto tmp = p;
+    auto weight = 1.0;
+
+    for (int i = 0; i < depth; i++) {
+        accum += weight * noise(tmp);
+        weight *= 0.5;
+        tmp *= 2.0;
+    }
+
+    return fabs(accum);
+}
diff --git a/src/perlin.h b/src/perlin.h
@@ -19,4 +19,5 @@ class Perlin {
     ~Perlin();
 
     double noise(const Point& point) const;
+    double turbulence(const Point& p, int depth = 7) const;
 };
diff --git a/src/texture.h b/src/texture.h
@@ -6,6 +6,7 @@
 
 #include <memory>
 #include <string>
+#include <cmath>
 
 class Texture {
 
@@ -104,7 +105,8 @@ class NoiseTexture : public Texture {
     NoiseTexture(double scale):_scale(scale) {}
 
     Color color(double u, double v, const Point &point) override {
-        return Color(1.0, 1.0, 1.0) * 0.5 * (1.0 + _noise.noise(_scale * point));
+        auto s = _scale * point;
+        return Color(1.0, 1.0, 1.0) * 0.5 * (1.0 + std::sin(s.z() + 10.0 * _noise.turbulence(s)));
     }
 
 };