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added refraction computations to Scene::traceRay()

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git-svn-id: svn://anubis/fart/trunk@376 7f9b0f55-74a9-4bce-be96-3c2cd072584d
This commit is contained in:
Josh Holtrop 2010-10-11 16:14:13 +00:00
parent 931cde802e
commit 22f4a79671
4 changed files with 21 additions and 8 deletions
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18
main/Scene.cc
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@ -119,13 +119,15 @@ void Scene::renderPixel(int x, int y, unsigned char * pixel)
Color Scene::traceRay(const Ray & ray) Color Scene::traceRay(const Ray & ray)
{ {
return traceRayRecurse(ray, m_max_depth, 1.0); static refptr<Material> air = new Material();
return traceRayRecurse(ray, m_max_depth, 1.0, air);
} }
/** /**
* factor: the proportion of the final color that this computation is worth * factor: the proportion of the final color that this computation is worth
*/ */
Color Scene::traceRayRecurse(const Ray & ray, int depth, double factor) Color Scene::traceRayRecurse(const Ray & ray, int depth, double factor,
refptr<Material> last_material)
{ {
Color color; Color color;
@ -161,7 +163,8 @@ Color Scene::traceRayRecurse(const Ray & ray, int depth, double factor)
Ray jitterNewRay(jitter_surface_point, reflected_direction); Ray jitterNewRay(jitter_surface_point, reflected_direction);
Color c = traceRayRecurse(jitterNewRay, Color c = traceRayRecurse(jitterNewRay,
depth - 1, depth - 1,
factor * reflectance); factor * reflectance,
material);
color += c * reflectance; color += c * reflectance;
} }
@ -171,10 +174,15 @@ Color Scene::traceRayRecurse(const Ray & ray, int depth, double factor)
color *= (1.0 - transparency); color *= (1.0 - transparency);
Vector jitter_surface_point = hit.position Vector jitter_surface_point = hit.position
+ ray.getDirection() * 0.0001; + ray.getDirection() * 0.0001;
Ray newRay(jitter_surface_point, ray.getDirection()); Vector refracted_direction =
ray.getDirection().refract(hit.normal,
last_material->getRefraction(),
material->getRefraction());
Ray newRay(jitter_surface_point, refracted_direction);
Color c = traceRayRecurse(newRay, Color c = traceRayRecurse(newRay,
depth - 1, depth - 1,
factor * transparency); factor * transparency,
material);
color += c * transparency; color += c * transparency;
} }
} }

3
main/Scene.h
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@ -46,7 +46,8 @@ class Scene
protected: protected:
/* private methods */ /* private methods */
Color traceRay(const Ray & ray); Color traceRay(const Ray & ray);
Color traceRayRecurse(const Ray & ray, int depth, double factor); Color traceRayRecurse(const Ray & ray, int depth, double factor,
refptr<Material> last_material);
Shape::Intersection getRayClosestHit(const Ray & ray); Shape::Intersection getRayClosestHit(const Ray & ray);
Color computePhong(const refptr<Material> material, Color computePhong(const refptr<Material> material,
const Ray & viewRay, const Ray & viewRay,

6
util/Material.h
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@ -42,7 +42,11 @@ class Material
void setReflectance(double reflectance) { m_reflectance = reflectance; } void setReflectance(double reflectance) { m_reflectance = reflectance; }
double getReflectance() const { return m_reflectance; } double getReflectance() const { return m_reflectance; }
void setRefraction(double refraction) { m_refraction = refraction; } void setRefraction(double refraction)
{
if (refraction > 0.0)
m_refraction = refraction;
}
double getRefraction() const { return m_refraction; } double getRefraction() const { return m_refraction; }
void setTransparency(double t) { m_transparency = t; } void setTransparency(double t) { m_transparency = t; }

2
util/Vector.h
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@ -77,7 +77,7 @@ class Vector
const double sinT2 = n * n * (1.0 - cosI * cosI); const double sinT2 = n * n * (1.0 - cosI * cosI);
if (sinT2 > 1.0) if (sinT2 > 1.0)
return Vector(0.0, 0.0, 0.0); return Vector(0.0, 0.0, 0.0);
return (*this) * n - target * (n + sqrt(1.0 - sinT2)); return (*this) * n - target * (n * cosI + sqrt(1.0 - sinT2));
} }
Vector getPerpendicular() const Vector getPerpendicular() const