60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
#ifndef TERRAINRAYWALKER_H
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#define TERRAINRAYWALKER_H
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#include "software_global.h"
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#include "Vector3.h"
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namespace paysages {
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namespace software {
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/*!
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* \brief Ray walker to find intersections with terrain.
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*
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* This walker can be used to find a hard intersection between
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* a ray and the terrain (e.g. for raytracing), or a soft intersection
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* (e.g. for shadows).
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*/
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class SOFTWARESHARED_EXPORT TerrainRayWalker
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{
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public:
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typedef struct {
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Vector3 hit_location; // Location of the hit
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double escape_length; // Length walked before terrain was escaped after hit (0.0 if no escape)
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} TerrainHitResult;
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public:
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TerrainRayWalker(SoftwareRenderer* renderer);
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/*!
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* \brief Update the walker internal data, from the renderer and scenery.
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*/
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void update();
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/*!
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* \brief Start the walking process to find intersection
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*
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* \param start Point of origin of the ray
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* \param direction Ray direction (normalized vector)
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* \param escaping_factor Factor used to escape the terrain on hit (mainly for shadows computing)
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* \param max_length Maximum length to walk before considering no hit
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* \param result Object to store the results info
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* \return true if there was a hit
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*/
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bool startWalking(Vector3 start, const Vector3 &direction, double escaping_factor, double max_length, TerrainHitResult &result);
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private:
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SoftwareRenderer* renderer;
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double ymin;
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double ymax;
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double ydispmin;
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double ydispmax;
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double minstep;
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double maxstep;
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};
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}
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}
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#endif // TERRAINRAYWALKER_H
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