77 lines
2.3 KiB
C++
77 lines
2.3 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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* 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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public:
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typedef struct {
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Vector3 hit_location; // Location of the hit
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double escape_angle; // Angle used to shift the ray to escape the terrain (0.0 if no escape was possible)
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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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* Set the walker quality.
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*
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* displacement_safety - Safety factor (around 1.0) to detect when displacement textures need to be applied
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* minimal_step - Minimal length of a walking step
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* maximal_step - Maximal length of a walking step
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* step_factor - Precision factor of steps, depending on terrain proximity
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* max_distance - Maximal distance allowed to travel before considering an escape
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* escape_step - Angle step when allowing an escape angle
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*/
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void setQuality(double displacement_safety, double minimal_step, double maximal_step, double step_factor,
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double max_distance, double escape_step);
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void setQuality(double factor);
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/**
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* 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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* Start the walking process to find intersection
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*
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* start - Point of origin of the ray
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* direction - Ray direction (normalized vector)
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* escape_angle - Maximal angle allowed to escape the terrain on hit (mainly for shadows computing)
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* result - Object to store the results info
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*
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* Returns true if there was a hit.
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*/
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bool startWalking(const Vector3 &start, Vector3 direction, double escape_angle, 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 displacement_base;
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// Quality control
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double displacement_safety;
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double minimal_step;
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double maximal_step;
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double step_factor;
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double max_distance;
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double escape_step;
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};
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}
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}
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#endif // TERRAINRAYWALKER_H
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