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- Intel Community
- Visual Computing (Graphics and Gaming)
- Intel® Embree Ray Tracing Kernels
- Clarification on RTC_GEOMETRY_TYPE_FLAT_LINEAR_CURVE "u" value.

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AndrewC

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03-18-2019
03:59 PM

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The documentation says "The intersection with the curve segment stores the parametric hit location

along the curve segment as u-coordinate (range 0 to +1)."

As linear curves are represented as cylindrical segments, then a ray will intersect the cylinder in two places. Is the point represented by "u" the closest point of the "ray" to the line? Or is the projection of the 'first' intersection of the ray with the cylinder onto the line?

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SvennW_Intel

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03-18-2019
10:48 PM

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It is the u-value of the closest point on the line to the ray.

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SvennW_Intel

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03-18-2019
10:48 PM

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It is the u-value of the closest point on the line to the ray.

For more complete information about compiler optimizations, see our Optimization Notice.