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Posted By

gyunjgf2 on 05/16/12

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Last Edited at 05/16/12 05:35pm

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Voxel Raycaster

/ Published in: C++
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Traverses unit cubes given a starting position and direction vector.

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  1. //Raycaster.h
  2.  
  3. #ifndef RAYCASTER_H
  4. #define RAYCASTER_H
  5.  
  6. #include <glm\glm.hpp>
  7.  
  8. class Raycaster
  9. {
  10. public:
  11. 	Raycaster(glm::vec3 p, glm::vec3 p_dir);
  12. 	glm::ivec3 getNextVoxel();
  13. private:
  14. 	glm::vec3 pos;
  15. 	glm::vec3 dir;
  16. 	bool xplus;
  17. 	bool yplus;
  18. 	bool zplus;
  19. };
  20.  
  21. #endif
  22.  
  23.  
  24. //Raycaster.cpp
  25. #include "Raycaster.h"
  26.  
  27. Raycaster::Raycaster(glm::vec3 p, glm::vec3 p_dir)
  28. {
  29. 	pos = p;
  30. 	dir = p_dir;
  31. 	xplus = true;
  32. 	yplus = true;
  33. 	zplus = true;
  34. 	if (dir.x < 0)
  35. 		xplus = false;
  36. 	if (dir.y < 0)
  37. 		yplus = false;
  38. 	if (dir.z < 0)
  39. 		zplus = false;
  40. }
  41.  
  42. glm::ivec3 Raycaster::getNextVoxel()
  43. {
  44. 	int nextX = (int) pos.x;
  45. 	int nextY = (int) pos.y;
  46. 	int nextZ = (int) pos.z;
  47. 	if (xplus)
  48. 		nextX++;
  49. 	if (yplus)
  50. 		nextY++;
  51. 	if (zplus)
  52. 		nextZ++;
  53. 	float distanceX = nextX - pos.x;
  54. 	float distanceY = nextY - pos.y;
  55. 	float distanceZ = nextZ - pos.z;
  56. 	float qx = distanceX / dir.x;
  57. 	float qy = distanceY / dir.y;
  58. 	float qz = distanceZ / dir.z;
  59.  
  60. 	//The qx/y/z+=0.000001; is a quick and dirty solution 
  61. 	//to enable the continuation of the raycast.
  62. 	if (qx <= qy && qx <= qz)
  63. 	{
  64. 		qx+=0.000001;
  65. 		pos += qx * dir;
  66. 	}
  67. 	else if (qy <= qx && qy <= qz)
  68. 	{
  69. 		qy+=0.000001;
  70. 		pos += qy * dir;
  71. 	}
  72. 	else if (qz <= qx && qz <= qy)
  73. 	{
  74. 		qz+=0.000001;
  75. 		pos += qz * dir;
  76. 	}
  77.  
  78. 	return glm::ivec3( (int) pos.x, (int) pos.y, (int) pos.z);
  79.  
  80. }

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