62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
#include "Triangle.h"
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namespace raytry {
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Triangle::Triangle(QVector3D a, QVector3D b, QVector3D c) : a{a}, b{b}, c{c} {
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an = bn = cn = QVector3D::crossProduct(b - a, c - a).normalized();
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}
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Triangle::Triangle(const QVector3D &a, const QVector3D &b, const QVector3D &c, const QVector3D &an, const QVector3D &bn, const QVector3D &cn, const RenderMaterial &mat) : a(a), b(b), c(c), an(an), bn(bn), cn(cn), mat(mat) {}
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std::optional<float> Triangle::intersects(const Ray &ray) const {
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// Möller, Trumbore
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const QVector3D &v0v1 = b - a;
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const QVector3D &v0v2 = c - a;
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const auto pvec = QVector3D::crossProduct(ray.directionVec, v0v2);
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const float det = QVector3D::dotProduct(v0v1, pvec);
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if (qFuzzyIsNull(det)) {
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return std::nullopt;
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}
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const float invDet = 1 / det;
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const auto tvec = ray.originVec - a;
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const float u = QVector3D::dotProduct(tvec, pvec) * invDet;
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if (u < 0 || u > 1) {
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return std::nullopt;
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}
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const auto qvec = QVector3D::crossProduct(tvec, v0v1);
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const float v = QVector3D::dotProduct(ray.directionVec, qvec) * invDet;
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if (v < 0 || u + v > 1) {
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return std::nullopt;
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}
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const auto& t = QVector3D::dotProduct(v0v2, qvec) * invDet;
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if (t < nearCrop) {
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return std::nullopt;
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}
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return std::make_optional<float>(t);
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}
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const QVector3D &Triangle::aVec() const {
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return a;
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}
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const QVector3D &Triangle::bVec() const {
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return b;
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}
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const QVector3D &Triangle::cVec() const {
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return c;
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}
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RenderMaterial Triangle::material() const {
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return mat;
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}
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void Triangle::setMaterial(RenderMaterial material) {
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mat = material;
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}
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QVector3D Triangle::calculateNormal(QVector3D hitpoint) const {
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// FIXME
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return an;
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}
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}// namespace raytry
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