56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
#ifndef CG1_TRACER_CLOUDSHADER_H
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#define CG1_TRACER_CLOUDSHADER_H
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#include "scene/scene.h"
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#include "shader.h"
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#include "light/light.h"
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#include "primitive/primitive.h"
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#include "common/noise/worleynoise.h"
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int const NOISE_SIZE = 128;
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float const TRANSMITTANCE_BREAK = 0.005f; // If transmittance goes below this limit, the cloud is considered opaque
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struct CloudSettings
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{
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int densitySamples = 100;
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int lightSamples = 100;
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float scale = 10;
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float densityOffset = -0.57f;
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float densityIntensity = 7.0f;
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float darknessThreshold = 0.07f;
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float shadowIntensity = 0.8f;
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float shadowLightAbsorption = 1;
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float lightAbsorptionTowardsLight = 0.94f;
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float lightAbsorptionThroughCloud = 0.85f;
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};
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class CloudShader : public Shader
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{
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public:
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CloudShader(CloudSettings const &settings = CloudSettings());
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// Shader functions
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Color shade(Scene const &scene, Ray const &ray) const;
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Color transparency(const Scene &scene, const Ray &ray, float maxLength) const override;
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private:
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CloudSettings settings;
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bool isTransparent() const;
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Noise cloudNoise;
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float getCloudDensity(Vector3d point) const;
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Color lightMarch(const Scene &scene, Vector3d currentInCloudPosition, Vector3d lengthDistance) const;
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float rayDensity(const Ray &ray, float maxLength) const;
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float scatterFactor(Vector3d visualRay, Vector3d illuminationRay) const;
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float HenyeyGreenstein(float cosTheta, float g) const;
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};
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#endif //CG1_TRACER_CLOUDSHADER_H
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