A signed-distance field sampled on a regular axis-aligned grid (negative inside solid). More...

#include <grid_sdf.hpp>

Public Member Functions
double	at (Index i, Index j, Index k) const
	Raw sample lookup at integer grid index (i,j,k); no bounds checking.

GridDesc< double >	desc () const
	Descriptor form of this field, for the shared sampler.

double	eval (const Vec< 3 > &p) const
	Trilinearly-interpolated signed distance at world point `p`.

Public Attributes
std::vector< float >	values
	Sample values, x-fastest: idx = i + jnx + knx*ny.

IVec< 3 >	dims {}
	Sample count per axis (nx, ny, nz).

Vec< 3 >	origin {}
	World position of sample (0,0,0).

Vec< 3 >	spacing {1, 1, 1}
	World-space distance between samples per axis.

Detailed Description

A signed-distance field sampled on a regular axis-aligned grid (negative inside solid).

Models the peclet::core::geom::Sdf concept via eval(). Storage is x-fastest, matching the suite indexing convention and the VTI fields produced by flow/dem.

Definition at line 24 of file grid_sdf.hpp.

Member Function Documentation

◆ at()

double peclet::core::geom::GridSdf::at	(	Index	i,
		Index	j,
		Index	k
	)		const

inline

Raw sample lookup at integer grid index (i,j,k); no bounds checking.

Definition at line 31 of file grid_sdf.hpp.

References dims, and values.

◆ desc()

GridDesc< double > peclet::core::geom::GridSdf::desc ( ) const

inline

Descriptor form of this field, for the shared sampler.

Built from spacing once per call here (this is host setup-side code, not a device inner loop); a hot path should hold the descriptor instead – see the rung-3 note in docs/ANALYTIC_SDF_GEOMETRY.md.

Definition at line 38 of file grid_sdf.hpp.

References dims, peclet::core::geom::kClamp, origin, and spacing.

Referenced by eval().

◆ eval()

double peclet::core::geom::GridSdf::eval ( const Vec< 3 > & p ) const

inline

Trilinearly-interpolated signed distance at world point p.

Queries outside the sampled box clamp to the nearest in-domain sample (GridExtension::kClamp).

DELEGATES to peclet::core::geom::sampleGrid, which is now the suite's single trilinear grid-SDF routine (it also serves dem's object/container policies). NOTE this changed the last bit of the result: the old body divided by spacing, the shared routine multiplies by its inverse, and a/s != a*(1/s) in floating point. Deliberate – multiplying is what dem's bit-exactness contract is written against and is cheaper on device.

Definition at line 60 of file grid_sdf.hpp.

References desc(), peclet::core::geom::sampleGrid(), and values.