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KeyShot 5: NURBS Raytracing - YouTube
https://www.youtube.com/watch?v=iZmrTkC-8ac
NURBS data import from your favorite modeling system delivers accurate geometry with smoother edges. NURBS import is currently available for all geometry for...
Practical Ray Tracing of Trimmed NURBS Surfaces
https://www.cs.utah.edu/gdc/publications/papers/raynurbs.pdf
2 Ray Tracing NURBS In ray tracing a surface, we pose the question “At what points does a ray intersect the surface?” We define a ray as having an origin and a unit direction r(t)=o+ d^ t: A non-uniform rational B-spline (NURBS) surface can be formulated as Sw(u;v)= MX−1 i=0
(PDF) Direct and fast ray tracing of NURBS surfaces
https://www.researchgate.net/publication/232644373_Direct_and_fast_ray_tracing_of_NURBS_surfaces
trimmed NURBS patches is still frequently causing problems as artifacts and long preprocessing times are introduced, whereas in- tegrating an online …
Plate Mode NURBS raytracing - BRL-CAD
https://brlcad.org/wiki/Plate_Mode_NURBS_raytracing
That is, when a ray intersects the surface, an "out" hit point is assigned some small distance from the initial hit point along the ray. BRL-CAD currently implements this modeling technique for the BoT primitive, and BoTs that utilize it are referred to as "plate mode". This task would be to implement plate mode raytracing for NURBS surfaces.
A new method for speeding up ray tracing NURBS surfaces
https://www.sciencedirect.com/science/article/pii/S0097849397872639
The method proposed for speeding tip ray tracing NURBS surfaces can reduce both the iteration steps and arithmetic operations, thus much CPU time is saved. The new method is faster than the previous methods for which published …
NURBS raytracing · Issue #77 · cihologramas/pyoptools · …
https://github.com/cihologramas/pyoptools/issues/77
1- The equation of the nurbs z=f (x,y) 2- The intersection point of the nurb and an arbitrary ray 3- The normal of the nurb surface at the intersection point. If you could help us with that, I can implement the nurbs surface in pyoptools fast. About your second question, yes it is possible to track a ray in the propagation.
Fast ray tracing NURBS surfaces | SpringerLink
https://link.springer.com/article/10.1007/BF02943518
Also, a ray is defined to be the intersection of two planes, which are non-orthogonal in general, in such a way that the number of multiplication operations is reduced. In the preprocessing step, NURBS surfaces are subdivided adaptively into rational Bézier patches. Parallelepipeds are used to enclose the respective patches as tightly as possible.
NURBS - BRL-CAD
https://brlcad.org/wiki/NURBS
NURBS features are considered complete or are demonstrated (but not yet considered adequate) include: import via 3DM and STEP file formats robust ray tracing of valid and solid entities non-solid tessellation for interactive visualization losslessly converting implicit entities unevaluated documented Boolean evaluation debugging process
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