These photons of different wave light reach our retina and our brain interprets them. The light source emits in the entire chromatic spectrum, but the rays are absorbed and reflected by the elements of our environment. Something that happens with all colors and materials. It only reflects the photons that are in the red color spectrum and for this reason we see it in that color. We see it red because the apple absorbs the rest of the colors of the light spectrum. Let's take a very red and beautiful apple, worthy of display. Really, the only thing we see are photons of light after impacting on a material.
Effects such as moving blur, depth of field, or subsampling were added to remove saw teeth.ĭepending on the roughness of the material and the spectra of light that it is capable of absorbing, we see one thing or another. Robert Cook in 1985 improved the basic Ray Tracing algorithm to similar other effects in images based on stochastic sampling, relying on the Monte Carlo method. While you stop the shadows, rays are thrown from an intersection point to the light source. Global lighting effects such as reflections, refractions, or cast shadows are taken into account here.įor reflection and refraction, you must have the material of the intersected object, since not all of them interact the same with light. Whereas ray tracing wants to determine the visible surfaces by adding the shading. The calculation of the intersections of the rays with the objects of the scene is carried out and the intersection determines which are the objects visible to the observer. Its initial proposal was made by Turner Whitted in 1980 and is based on an algorithm for determining visible surfaces written by Artur Appel in 1968 that was named Ray Casting.īasically Ray Casting is an algorithm that calculates the amount of visible surfaces in a scene where you want to synthesize the ray traces from the observer's point.
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