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Ray tracing (graphics) - Wikipedia
https://en.wikipedia.org/wiki/Ray_tracing_(graphics)#:~:text=1%20A%20reflection%20ray%20is%20traced%20in%20the,shadow%20ray%20is%20traced%20toward%20each%20light.%20
Ray Tracing Basics
https://web.cse.ohio-state.edu/~shen.94/681/Site/Slides_files/basic_algo.pdf
Ray Tracing Basics CSE 681 Autumn 11 Han-Wei Shen Forward Ray Tracing •We shoot a large number of photons Problem? Backward Tracing For every pixel Construct a ray from the eye For every object in the scene Find intersection with the ray Keep if closest The Viewing Model •Based on a simple Pinhole Camera model Simplest lens model Inverted image
Ray Tracing Basics
https://www.cs.cornell.edu/courses/cs4620/2011fa/lectures/08raytracingWeb.pdf
Scene.trace(Ray ray, tMin, tMax) {surface, t = hit(ray, tMin, tMax); if surface is not null {point = ray.evaluate(t); normal = surface.getNormal(point); return surface.shade(ray, point, normal, light);} else return backgroundColor;} … Surface.shade(ray, point, normal, light) {v = –normalize(ray.direction); l = normalize(light.pos – point);
Ray Tracing Basics I
http://cs.rit.edu/~jmg/courses/cgII/20072/slides/2-2-raytraceBasics1.pdf
Ray Tracing in the real world Light is emitted from light source Bounces off of the environment Assumptions Light travels in straight rays Path of light changes based on object interaction. Can simulate using basic geometry. Some light will reach and be focused by camera onto film plane. Lots of light will not!
Basic Ray Tracing - University of Texas at Austin
https://www.cs.utexas.edu/~theshark/courses/cs354/lectures/cs354-4.pdf
Whitted-style Ray Tracing • Turner Whitted introduced ray tracing to graphics in 1980 • Combines eye ray tracing + rays to light and recursive tracing • Algorithm: 1. For each pixel, trace primary ray in direction V to the first visible surface. 2. For each intersection trace secondary rays: • Shadow in direction L to light sources
Ray Tracing I: Basics
https://graphics.stanford.edu/courses/cs348b-21-spring-content/lectures/02_rt1/02_rt1_slides.pdf
Ray Tracing in Computer Graphics. Appel 1968 - Ray casting 1. Generate an image by casting one ray per pixel 2. Check for shadows by sending a ray to the light. Pat Hanrahan / Matt Pharr, Spring 2021. Ray Tracing in Computer Graphics. CS348b Lecture 2 Pat Hanrahan / …
Ray Tracing Basics
https://www.cs.cornell.edu/courses/cs4620/2011fa/lectures/07raytracingWeb.pdf
Generating eye rays—perspective •View rectangle needs to be away from viewpoint •Distance is important: “focal length” of camera –still use camera frame but position view rect away from viewpoint –ray origin always e –ray direction now controlled by s 3 s e d =s –e p = e r(t) = p+ td © 2011 Kavita Bala •
Lecture 12: Ray Tracing Basics - University of Washington
https://courses.cs.washington.edu/courses/cse457/99au/handouts/lectures/raytracing-basics.pdf
3. Ray Tracing. • A term from optics • A “physical” simulation of the particle theory of light • In the 1960s, ray tracing seemed like a great idea, but nobody could do it well enough to beat cheaper image synthesis methods. • These days, we can follow the …
Basic Ray Tracing - Inspiring Innovation
https://www.csee.umbc.edu/~adamb/435/Slides/raytrace.pdf
Ray Tracing Reflection • Viewer looking in direction d sees whatever the viewer “below” the surface sees looking in direction r • In the real world – Energy loss on the bounce – Loss different for different colors • New ray – Start on surface, in reflection direction
Basic Raytracing - Computer Graphics from Scratch
https://www.gabrielgambetta.com/computer-graphics-from-scratch/02-basic-raytracing.html
We know the ray passes through O, and we know its direction (from O to V ), so we can express any point P in the ray as P = O + t ( V − O) where t is any real number. By plugging every value of t from − ∞ to + ∞ into this equation, we get every point P along the ray. Let’s call ( V − O), the direction of the ray, D →. The equation becomes
Ray tracing tutorial - section 1: basics
https://www.groovyvis.com/other/raytracing/basic.html
Generally, raytracing uses objects that can be defined mathematically by 1st or 2nd degree equations. Then, the pixel through which the ray passes is set to the color of the intersected object at the point of intersection. Closer of the intersections is taken. Reflections and shadows are achieved through what is known as recursive ray tracing.
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