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Texture mapping in a ray tracing for sphere in C++ - Stack ...
https://stackoverflow.com/questions/22420778/texture-mapping-in-a-ray-tracing-for-sphere-in-c
I have set up a simple ray tracing in C++. I wanted to add the texture mapping to the sphere. It basically just map the texture from a PPM file to the sphere. Below are my code for the part. //Call shaderay from trace ray function // index_of_winning_object = index of scene object array // point = intersection point Color shadeRay (int index_of ...
Ray Tracing: Texture Map a Sphere - Graphics and GPU ...
https://gamedev.net/forums/topic/632060-ray-tracing-texture-map-a-sphere/4985722/
In the link I provide as source, it seems that the equations take a north vector, a right vector, and a 3rd vector (cross-product of the first 2), so this would give us 3 axis to manipulate the sphere, but alas, whenever I mess with those, the resulting image has flaws, most common is texture mirroring along some axis on the sphere...
Texture Mapping - Ray Tracer Challenge
http://raytracerchallenge.com/bonus/texture-mapping.html
Write a function texture_map (uv_pattern, uv_map), which returns a new TextureMap pattern instance that encapsulates the given uv_pattern (like uv_checkers ()) and uv_map (like spherical_map () ). Here's a test, showing how the new pattern works with a smattering of random points on a unit sphere: patterns.feature.
Texture Mapping Ray Tracing Texture Mapping
https://www.irisa.fr/prive/kadi/Cours_LR2V/RayTracing_Texturing.pdf
Texture Mapping Sphere – How to compute Texture coordinates – Given an intersection P lying on a sphere – Compute its texture coordinates (s,t) as: π π π cos (x/( sin ( s)))/2 cos( / ) / t a r s a z r = = Texture Mapping & Illumination • Texture mapping can be used to alter some or all of the constants in the illumination equation:
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
Sphere coordinates are useful for texture mapping or procedural texturing. The program of this lesson will show how they can be used to draw a pattern on the surface of the spheres. Implementing the Ray-Sphere Intersection Test in C++. Let's now see how we can implement the ray-sphere intersection test using the analytic solution.
Ray Tracing: Texture Mapping
https://ray-tracing-conept.blogspot.com/2015/01/texture-mapping.html
Algorithm: The easiest way to texture map onto a sphere is by defining v to be the latitude of the point and u to be the longitude of the point on the sphere. This way, the texture image will be "wrapped" around the sphere, much as a rectangular world map is wrapped around a globe. Figure 8. Mapping a rectangular world map onto a globe. Figure 9.
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