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Parallel projection - Wikipedia
https://en.wikipedia.org/wiki/Parallel_projection
Equation for the ray with parallel projection - Stack Overflow
https://stackoverflow.com/questions/20535357/equation-for-the-ray-with-parallel-projection
ray = pO + t * normalize (d + (x - 0.5w)/0.5w * r + (y - 0.5h)/0.5h * u) where t is the parameter. For a parallel projection, move the virtual screen to the origin and calculate the x, y to be the origin of the ray then use the same direction d for each ray: ray = (pO + (x - 0.5w)/0.5w * r + (y - 0.5h)/0.5h * u) + t*d Share
Basic Ray Tracing - Inspiring Innovation
https://www.csee.umbc.edu/~adamb/435/Slides/raytrace.pdf
Full Ray-Tracing • For each pixel – Compute ray direction – Find closest surface – For each light • Shoot shadow ray • If not shadowed, add direct illumination – Shoot ray in reflection direction – Shoot ray in refraction direction Dielectric if (pis on a dielectric) then r= reflect (d, n) if (d.n< 0) then refract (d, n, n, t) c = -d.n
Ray Tracing - University of Wisconsin–Madison
https://graphics.cs.wisc.edu/WP/cs559-fall2016/files/2016/12/shirley_chapter_4.pdf
72 4. Ray Tracing perspective oblique Figure 4.4. A parallel projection that has the image plane at an angle to the projection di-rection is called oblique (right). In perspective projection, the projection lines all pass through the viewpoint, rather than being parallel (left). The illustrated perspective view is non-oblique
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