67 lines
2.1 KiB
C++
67 lines
2.1 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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float const TRANSMITTANCE_BREAK = 0.0001f; // 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 noiseSize = 256; // 64
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unsigned int seed = 0; // 0 for random seed
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float densitySteps = .2f; // .2f
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float scale = 30; // 30
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float densityOffset = -.55f; // -.55f
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float densityIntensity = 5.0f; // 5.0f
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float darknessThreshold = .1f; // .1f
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float shadowIntensity = .6f; // .6f
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float shadowLightAbsorption = 1; // 1
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float lightAbsorptionTowardsLight = 0.1f; // .3f // How Bright should the clouds be? Lower is brighter
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float lightAbsorptionThroughCloud = .8f; // .8f // How dark should the background be where the cloud is? Higher values mean darker background
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float phaseA = .8f; // .5f
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float phaseB = .4f; // .3f
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float phaseOffset = .8f; // .8f
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float phaseIntensity = .1f; // 1.0f
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float edgeFadeOffDistance = .5f; // .5f
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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 Primitive *primitive = nullptr) const;
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Color lightMarch(const Scene &scene, Vector3d currentInCloudPosition, Vector3d lengthDistance,
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const Primitive *cloudObject) const;
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float rayDensity(const Ray &ray, float maxLength) const;
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float phase(Vector3d visualRay, Vector3d illuminationRay) const;
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static float calcDualHenyeyGreenstein(float cosTheta, float g) ;
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static float calcBeer(float d) ;
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float getEdgeDensity(const Vector3d &point, const Primitive *primitive) const;
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};
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#endif //CG1_TRACER_CLOUDSHADER_H
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