work on raytracing

geo/volume/BoundingVolumeSphere.h

@@ -0,0 +1,27 @@
+#ifndef BOUNDINGVOLUMESPHERE_H
+#define BOUNDINGVOLUMESPHERE_H
+
+#include "../Point3.h"
+
+class BoundingVolumeSphere : public BoundingVolume {
+
+private:
+
+	Point3 center;
+
+	float radius;
+
+public:
+
+	float getVolumeSize() const override {
+		return (4.0f / 3.0f) * M_PI * (radius*radius*radius);
+	}
+
+	/** does the volume contain the given point? */
+	virtual bool contains(const Point3 p) const {
+		return (center-p).length() <= radius;
+	}
+
+};
+
+#endif // BOUNDINGVOLUMESPHERE_H