79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
#ifndef RAY3_HPP
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#define RAY3_HPP
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#include "vectorlogic/vec3.hpp"
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template<typename T>
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class Ray3 {
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public:
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Vec3<T> origin;
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Vec3<T> direction;
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Ray3() : origin(Vec3<T>()), direction(Vec3<T>(1, 0, 0)) {}
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Ray3(const Vec3<T>& origin, const Vec3<T>& direction)
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: origin(origin), direction(direction.normalized()) {}
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// Get point at parameter t along the ray
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Vec3<T> at(float t) const {
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return origin + direction * t;
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}
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// Reflect ray off a surface with given normal
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Ray3 reflect(const Vec3<T>& point, const Vec3<T>& normal) const {
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Vec3<T> reflectedDir = direction.reflect(normal);
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return Ray3(point, reflectedDir);
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}
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// Check if ray intersects with a sphere
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bool intersectsSphere(const Vec3<T>& center, T radius, T& t1, T& t2) const {
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Vec3<T> oc = origin - center;
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float a = direction.dot(direction);
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float b = 2.0f * oc.dot(direction);
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float c = oc.dot(oc) - radius * radius;
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float discriminant = b * b - 4 * a * c;
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if (discriminant < 0) {
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return false;
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}
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discriminant = std::sqrt(discriminant);
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t1 = (-b - discriminant) / (2.0f * a);
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t2 = (-b + discriminant) / (2.0f * a);
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return true;
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}
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// Check if ray intersects with a plane (defined by point and normal)
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bool intersectsPlane(const Vec3<T>& planePoint, const Vec3<T>& planeNormal, T& t) const {
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float denom = planeNormal.dot(direction);
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if (std::abs(denom) < 1e-10f) {
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return false; // Ray is parallel to plane
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}
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t = planeNormal.dot(planePoint - origin) / denom;
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return t >= 0;
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}
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// Get the distance from a point to this ray
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float distanceToPoint(const Vec3<T>& point) const {
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Vec3<T> pointToOrigin = point - origin;
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Vec3<T> crossProduct = direction.cross(pointToOrigin);
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return crossProduct.length() / direction.length();
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}
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// Ray3 transform(const Mat4<T>& matrix) const {
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// Vec3<T> transformedOrigin = matrix.transformPoint(origin);
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// Vec3<T> transformedDirection = matrix.transformDirection(direction);
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// return Ray3<T>(transformedOrigin, transformedDirection.normalized());
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// }
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std::string toString() const {
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return "Ray3(origin: " + origin.toString() + ", direction: " + direction.toString() + ")";
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}
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};
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using Ray3f = Ray3<float>;
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#endif |