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(PDF) Efficient Shadow Computations in Ray Tracing
https://www.researchgate.net/publication/3208338_Efficient_Shadow_Computations_in_Ray_Tracing#:~:text=Two%20techniques%20to%20speed%20up%20shadow%20computations%20in,accelerates%20shadow%20computation%20of%20linear%20and%20area%20lights.
Ray-Traced Shadows — Blender Manual
https://docs.blender.org/manual/en/2.79/render/blender_render/lighting/shadows/raytraced_properties.html
This slider sets the maximum number of samples that both Constant QMC and Adaptive QMC will use to do their shadow calculations. The maximum value is …
(PDF) Efficient Shadow Computations in Ray Tracing
https://www.researchgate.net/publication/3208338_Efficient_Shadow_Computations_in_Ray_Tracing
We can compute ray -traced shadows for simple lights by shooting a ray from the point to be shaded to each light source. If we assume the tessellated polygon to be the main primitive of …
c++ - Raytracing Shadows - Stack Overflow
https://stackoverflow.com/questions/25942554/raytracing-shadows
double Sphere::findParam(const Ray &r) const { Vector rorig = r.getOrigin(); Vector rdir = r.getDirection(); Vector center = getPosition(); double det, t0 , t1; // det is the determinant of the quadratic equation: B² - 4AC; double a = (rdir|rdir); //one could optimize a away cause rdir is a unit vector double b = ((rorig - center)|rdir)*2; double c = ((rorig - center)|(rorig - center)) - …
Ray tracing: shadow ray path calculation question ...
https://www.reddit.com/r/GraphicsProgramming/comments/ib2kqu/ray_tracing_shadow_ray_path_calculation_question/
level 1. Liquos. · 1y. There is typically a difference between a “shadow ray” and an “indirect light ray”. Let’s say you have a white diffuse ground, a wine glass, and an area light. Say we want to calculate the caustic from the glass onto the ground. The way forward path tracers deal with this is that a straight line is traced from ...
c++ - Shadow rays in Raytracing - Computer Graphics Stack ...
https://computergraphics.stackexchange.com/questions/1734/shadow-rays-in-raytracing
To avoid self-intersections, you need to push the start point of the ray along its direction by epsilon: glm::vec3 direction = normalize(ldir); glm::vec3 start = surfacePoint + epsilon * direction; float intersections = myObjGroup->testIntersections(start, direction);
Lecture 2: Introduction to Ray Tracing
https://inst.eecs.berkeley.edu/~cs294-13/fa09/lectures/scribe-lecture1.pdf
ray tracing. I= K a+ k e+ Xn i=1 V iL imax(l in;0) + K smax(h in;0))s) K a: ambient K e: emission from material K d: di use K s: specular V i: visibility L i: intensity l i: light vector h i: re ection vector s : specularity 2.5 Recursive Ray Tracing For each pixel Trace Primary Eye Ray and nd intersection Trace secondary shadow rays to all lights Trace Re ected/Refracted Ray 5
Adaptive Shadow Testing for Ray Tracing
https://floyd.lbl.gov/radiance/papers/erw91/erw91.html
The scene is sorted according to the polygons visible from each source, and shadow testing takes advantage of the fact that it does not matter where obstruction occurs between the source and test point in question. (Normally, ray tracing algorithms are optimized to find the first intersection -- here we just want to find some intersection.) Although this approach offers significant …
Ray-tracing x-rays
https://www.esrf.fr/computing/scientific/raytracing/
The essential tool or engine for x-ray optics calculations is the ray-tracing program SHADOW, developed at Nanotech-Wisconsin(University of Wisconsin). SHADOW is a general purpose ray tracing code specially designed forsynchrotron radiation beamline optics. You may want to vistit the SHADOWWWW Home Page at NanoTech, where you can find instructions for download the …
SHADOW3: a new version of the synchrotron X-ray optics ...
https://journals.iucr.org/s/issues/2011/05/00/bf5038/bf5038.pdf
Ray-tracing calculations can sometimes be tedious owing to the high number of beamline parameters and combinations to analyze. The optimization of a single parameter can be done manually or automatically by sampling the parameter and performing a loop of SHADOW runs.
Calculating black hole shadows: Review of analytical ...
https://www.sciencedirect.com/science/article/pii/S0370157321003811
This calculation of the shadow in the Kottler spacetime exemplifies the important fact that, in a space–time which is not asymptotically flat, the critical impact parameter does not provide us with information about the shadow size: Dividing the critical impact parameter by the radial coordinate of the observer does not give us the angular size of the shadow, not even for …
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