gpuray_glsl

annotate src/plane.cc @ 5:000017955721

fixed the cone normal
author John Tsiombikas <nuclear@member.fsf.org>
date Tue, 11 Nov 2014 20:25:59 +0200
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nuclear@0 1 #include "plane.h"
nuclear@0 2
nuclear@0 3 Plane::Plane()
nuclear@0 4 : normal(0.0, 1.0, 0.0)
nuclear@0 5 {
nuclear@0 6 dist = 0.0;
nuclear@0 7 }
nuclear@0 8
nuclear@0 9 Plane::Plane(const Vector3 &norm, float dist)
nuclear@0 10 : normal(norm)
nuclear@0 11 {
nuclear@0 12 normal.normalize();
nuclear@0 13 this->dist = dist;
nuclear@0 14 }
nuclear@0 15
nuclear@0 16 bool Plane::intersect(const Ray &inray, HitPoint *pt) const
nuclear@0 17 {
nuclear@0 18 Ray ray = inray.transformed(inv_xform);
nuclear@0 19
nuclear@0 20 float ndotdir = dot_product(normal, ray.dir);
nuclear@0 21 if(fabs(ndotdir) < 1e-5) {
nuclear@0 22 return false; // ray parallel to the plane
nuclear@0 23 }
nuclear@0 24
nuclear@0 25 Vector3 planept = normal * dist;
nuclear@0 26 Vector3 pptdir = planept - ray.origin;
nuclear@0 27
nuclear@0 28 float t = dot_product(normal, pptdir) / ndotdir;
nuclear@0 29 if(t < 1e-4) {
nuclear@0 30 return false; // discard intersections behind the origin
nuclear@0 31 }
nuclear@0 32
nuclear@0 33 // fill the HitPoint structure
nuclear@0 34 pt->obj = this;
nuclear@0 35 pt->dist = t;
nuclear@0 36
nuclear@0 37 pt->pos = ray.origin + ray.dir * t;
nuclear@0 38
nuclear@0 39 pt->texcoord.x = pt->pos.x;
nuclear@0 40 pt->texcoord.y = pt->pos.z;
nuclear@0 41
nuclear@0 42 pt->pos.transform(xform);
nuclear@0 43 pt->normal = normal.transformed(dir_xform);//.normalized();
nuclear@0 44 return true;
nuclear@0 45 }