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lecture 18 - ray tracing - environment mapping
http://www.cim.mcgill.ca/~langer/557/18-slides.pdf
Environment Mapping If you want real time graphics with mirror surfaces, use "environment mapping" instead. An "environment map" is a "360 deg" RGB image of a scene, defined on the unit sphere centered at some scene point. We denote it E(rx, ry, rz) whereris direction of rays to the environment as seen from the scene point. physicalE(rx, ry, rz)
Difference between reflection mapping and raytracing
https://gamedev.stackexchange.com/questions/167458/difference-between-reflection-mapping-and-raytracing
Reflection mapping is effectively the ray tracing method with two optimizations: Only one reflection is performed. The result is retrieved from an environment map. Since the environment maps are pre-generated, they do not respond to changes in the scene and this is where reflection mapping majorly differs from ray-tracing.
Environment mapping and other applications of world …
https://www.academia.edu/731752/Environment_mapping_and_other_applications_of_world_projections
While ray tracing is unquestionably the more versatile and comprehensive technique, since it handles shadows and multiple levels of reflection and refraction,3 environment mapping is superior in some ways, quite aside from its enor- mous advantage in speed.
Computer Graphics Learning - Environment Mapping
https://cglearn.codelight.eu/pub/computer-graphics/environment-mapping
Entire environment is mapped to one image, we can sample from it, instead of a cube. The center, where the reflection angle is near 0°, has good resolution. Cons: There is a blind spot exactly behind the sphere. The edges, where the reflection angle is near 90°, may have aliasing, because we do not have enough pixels to hold the data.
Reflection mapping - Wikipedia
https://en.wikipedia.org/wiki/Reflection_mapping
What’s the Difference Between Ray Tracing and …
https://blogs.nvidia.com/blog/2018/03/19/whats-difference-between-ray-tracing-rasterization/
In fact, because ray tracing is so computationally intensive, it’s often used for rendering those areas or objects in a scene that benefit the most in visual quality and realism from the technique, while the rest of the scene is rendered using rasterization. Rasterization can still deliver excellent graphics quality. What’s Next for Ray Tracing?
Path Tracing vs Ray Tracing - Dusterwald.com
https://www.dusterwald.com/2016/07/path-tracing-vs-ray-tracing/
When it hits a surface it doesn’t trace a path to every light source, instead it bounces the ray off the surface and keeps bouncing it until it hits a light source or exhausts some bounce limit. It then calculates the amount of light transferred all the way to the pixel, including any colour information gathered from surfaces along the way.
What is ray tracing, and how does it differ from game to …
https://www.pcgamer.com/what-is-ray-tracing/
The ray tracing ends up being less complex, allowing for higher framerates, though there's still a balancing act between quality and performance. Casting more rays for a scene can improve the...
What's the difference between path tracing, ray tracing …
https://news.ycombinator.com/item?id=9994935
With photon mapping you trace a ray from a light source and store the light energy for the area where the light hits an object. With path tracing you ray trace a ray from the camera and every time you hit an object you check if you can see a light source from that spot. If true you return all the gathered energy back to the camera (pixel).
Ray Tracing vs Rasterized Rendering – Explained
https://appuals.com/ray-tracing-vs-rasterized-rendering-explained/
Ray Tracing is a rendering technique that creates an image based on virtual light and how that light source interacts with all the objects inside the virtual scene. Ray Tracing can create a far more life-like depiction of scenes that take advantage of the interaction of light with the objects inside the scene to give a sense of realism.
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