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Field Measure

fields/field-measure·v1.5.1

IN:1 OUT:1

SUMMARY

Field Measure takes a grid that only carries an occupancy, such as a solver's density or a TOP to POP image grid, and completes it as a POPX field: Dist, the signed distance to the surface where Weight crosses Threshold, its unit Gradient, and Velocity measured from how that surface moved since the previous frame. Without a Weight Attribute, the average of the color's RGB is used as the occupancy.

Scale and Center place a grid built at another size in world units, and Resolution can average the input down first for speed at a coarser result. Neighborhood sets the region Velocity is solved over, and the output drives Field Falloff, Field Render and the solvers like a field from Field or Voxelize.

PARAMETERS

PAGEField Measure

[+]Resolution	Resolution	Sets the resolution the input is measured at. Lower values average the input down first: faster, with a coarser Dist, Gradient and Velocity.
Scale	Scale	Scales the input positions uniformly (the input keeps its proportions) before measuring, so Dist, Gradient and Velocity are in the scaled world units.
[+]Center	Center	Translates the input positions after the Scale.
Measure Dist (SDF)	Measuresdf	Enable writing Dist, the signed distance to the Weight surface, negative inside. Needed by Gradient and Velocity.
Threshold	Threshold	Weight value of the surface. Cells above it are inside.
Measure Gradient	Measuregradient	Whether to output the Gradient attribute, the unit normal of Dist pointing outward.
Measure Velocity	Measurevelocity	Measure Velocity, in units per second, from how the shape moved since the previous frame. Needs Measure Dist.
Velocity Scale	Velocityscale	Multiplies the output Velocity.
Neighborhood	Neighborhood	Sets the size of the neighborhood Velocity is solved over, in world units. Larger catches the full motion, smaller keeps detail between nearby shapes.
Reset Velocity	Resetvelocity	Clears the velocity history so the next frame outputs zero.
Display Field	Displayfield	Enable drawing the occupied voxels as points.
Display Bounds	Displaybounds	Display the field box.
Color Attribute	Colorattr	Selects the input attribute carried as the field's Color.
Weight Attribute	Weightattr	Selects the input attribute measured as the occupancy and written as Weight. Without it, the average of the Color Attribute's RGB is used.
Output 3D Textures	Output3dtextures	Whether to output one 3D texture per field attribute.

PAGECommon

Bypass	Bypass	Pass through the first input to the output unchanged.
Free Extra GPU Memory	Freeextragpumem	Free memory that has accumulated when output memory has grown and shrunk.

INPUTS

Input 0 POP - Field 1

OUTPUTS

Output 0 POP - Field