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c++ - Ray tracing sphere reflection bug - Stack Overflow
https://stackoverflow.com/questions/47858571/ray-tracing-sphere-reflection-bug
const Material & m = i.getMaterial(); double t = i.t; Vec3d N = i.N; Vec3d I = m.shade(scene, r, i); //local illumination if (!m.kr(i).iszero() && depth >= 0) { // compute reflection direction Vec3d raydir = r.getDirection(); Vec3d refldir = 2 * dot(-raydir, i.N) * i.N + raydir; refldir.normalize(); ray reflectionRay = ray(r.at(i.t), refldir, ray::RayType::REFLECTION); Vec3d …
Ray Tracing - University of Washington
https://courses.cs.washington.edu/courses/csep557/19sp/assets/lectures/ray-tracing-1pp.pdf
Ray-tracing pseudocode, revisited functiontraceRay(scene, P, d): (t Ç, N, mtrl) ¬scene.intersect(P, d) Qßray (P, d) evaluated at t Ç I= shade (scene, mtrl, Q, N, d) R= reflectDirection(N, d) I ¬I+ mtrl.k s*traceRay(scene, Q, R) ifray is entering object then hi= index_of_air(=1.0003) h t= mtrl.index else hi= mtrl.index ht= index_of_air(=1.0003)
c++ - Ray Tracing - Reflection - Stack Overflow
https://stackoverflow.com/questions/22191070/ray-tracing-reflection
traceRay(Ray ray, int counter){ // look through the intersection between ray and list of objects // find the final index aka the winning index, (if final index == -1, return background color) // then calculate the intersection point // perform reflection calculation here if(counter > 1 && winning object's reflectivity > 1 ){ //get the intersection normal, vector N //Calculate the …
WebGL — 2.1 Ray Tracing with reflections - Medium
https://medium.com/neosavvy-labs/webgl-2-1-ray-tracing-with-reflections-bd5e52953e2f
RayTracing – Adding Reflection and Refraction – Cheney …
https://cheneyshen.com/raytracing-adding-reflection-and-refraction/
First we compute the reflection direction. For that we need two items: the normal at the point of intersection and the primary ray’s direction. Once we obtain the reflection direction, we shoot a new ray in that direction. Going back to our old example, let’s say the reflection ray hits the red sphere.
Introduction to Ray Tracing: a Simple Method for Creating …
https://www.scratchapixel.com/lessons/3d-basic-rendering/introduction-to-ray-tracing/adding-reflection-and-refraction
First we compute the reflection direction. For that we need two items: the normal at the point of intersection and the primary ray's direction. Once we obtain the reflection direction, we shoot a new ray in that direction. Going back to our old example, …
Strange sphere reflection effects in ray tracing project. I …
https://computergraphics.stackexchange.com/questions/9063/strange-sphere-reflection-effects-in-ray-tracing-project-i-cannot-figure-out-wh
Find point P of the intersection. Find normal vector N at the intersection with C being the sphere center: N = P - C N = N / norm (N) Find reflection vector R using (where D is the original ray direction: R = D - 2 * (D * N ) * N R = R / norm (R) Shift point P along R a little bit (to avoid reflection acne, adding this didn't solve the problem) P = P + 1e-4 * R.
Ray Tracing Basics I
http://cs.rit.edu/~jmg/courses/cgII/20072/slides/2-2-raytraceBasics1.pdf
Most of the computation in ray tracing is determining ray object-intersection When a ray intersects an object, we need to know: Point of intersection Normal of surface at point of intersection Ray-Sphere Intersection The Sphere A sphere can be defined by: Center (x c, y c, z c) Radius r Equation of a point (x s, y s, z s) on a sphere:
A Minimal Ray-Tracer: Rendering Simple Shapes (Sphere, …
https://www.scratchapixel.com/lessons/3d-basic-rendering/minimal-ray-tracer-rendering-simple-shapes/ray-sphere-intersection
The equation for a sphere is: x 2 + y 2 + z 2 = R 2. Where x, y and z are the coordinates of a cartesian point and R is the radius of a sphere centred at the origin (will see later how to change the equation so that it works with spheres which are not centred at the origin).
Ray Tracing: Ray Sphere Intersection - Blogger
https://ray-tracing-conept.blogspot.com/2015/01/ray-sphere-intersection.html
here p is point on sphere and c is center of sphere. Ray Equation in parametric form: p (t) = e + t d. e = camera position. d = ray direction which we constructed in Image plane setup i.e. (s-e) s is pixel center coordinate. t = unknown. Replacing ray equation in …
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