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EBGeometry
Compact, header-only C++ library for fast evaluation of signed distance functions
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The deciding leaf of a composition at a point: the primitive whose surface the composed value comes from there, as Tape::closestPrimitive() reports it. More...
#include <EBGeometry_PrimitiveRef.hpp>
Public Attributes | |
| uint32_t | m_leaf = None |
| The leaf: its number in expression order, depth first, each occurrence counted. | |
| uint32_t | m_type = None |
| The index of the primitive's type in the tape's type list (the built-in types, then UserPrimitives). | |
| uint32_t | m_index = None |
| The primitive's index within that type's array. | |
| Vec3T< T > | m_localPoint = Vec3T<T>::zeros() |
| The point in the primitive's own frame (after the composition's maps), at which it can be queried itself: its signed distance, closest face or normal. | |
Static Public Attributes | |
| static constexpr uint32_t | None = 0xFFFFFFFFU |
| No leaf (an empty composition). | |
The deciding leaf of a composition at a point: the primitive whose surface the composed value comes from there, as Tape::closestPrimitive() reports it.
A union or intersection takes the leaf of the operand whose value it takes; a smooth one the more extreme operand's; a blur its center tap's, a mollification its heaviest tap's; a complement, offset, annulus, map, elongation or repetition its operand's. For Difference(box, sphere), a point near the carved cavity gets the sphere and a point near the box's outside gets the box. This is the leaf that decides the value, not the geometrically nearest primitive, which could be one the composition removed. A nested composite (a fused composition, which is one shape with one surface; a tape listed as a primitive; a BVH union) is one leaf.
The tape that made the reference returns the primitive itself: isPrimitive<P>(ref), primitive<P>(ref) (by value: the shape, or a pool-resident one's handle rebuilt with the tape's location) and visitPrimitive(ref, f).
| T | Floating-point precision. |
1.9.8