Operations on Radiant SDF Docs

Operation Union

Mon, 01 Jan 0001 00:00:00 +0000

Operation Union

Inputs

float Left

float Right

Behaviour

Combines two signed distance fields into a single distance field. This operation only leaves the outside of the distance field intact. The interior will not be a mathematically correct distance field after this operation.

Operation Smooth Union

Mon, 01 Jan 0001 00:00:00 +0000

Operation Smooth Union

Inputs

float Left

float Right

float SmoothingFactor | default 0.0

Behaviour

Combines two signed distance fields into a single distance field, including a smoothing factor. Increased smoothing factors soften the transition between signed distance field shapes. This operation only leaves the outside of the distance field intact. The interior will not be a mathematically correct distance field after this operation.

Operation Outline

Mon, 01 Jan 0001 00:00:00 +0000

Operation Outline

Inputs

float Sdf

float Thickness | default 0.1

Behaviour

Generates an outline from the provided signed distance field. The outline will be the expanded by the provided thickness parameter.

Operation Hard Shape

Mon, 01 Jan 0001 00:00:00 +0000

Operation Hard Shape

Inputs

float SDF

Behaviour

Converts the signed distance field to a mask, where outside of the sdf is black and inside of the sdf is white. The Transition is a hard but antialiased line.

Properties

EHardShapeFunction HardShapeFunction | default Smoothstep

With the HardShapeFunction property one may choose which function to use in order to generate the hard shape.

Smoothstep: generally the cheapest and good results over all.
MaxDerivative: more expensive but provides better results for very thin shapes
MaxUVDerivative: requires the base space used for the SDF but has the best results for very thin shapes. However it may break when the sdf is not exact anymore.

SmoothStep

Max Derivative

Max UV Derivative

Operation Intersection

Mon, 01 Jan 0001 00:00:00 +0000

Operation Intersection

Inputs

float Left

float Right

Behaviour

Generates the intersection between the two provided signed distance fields. The overlapping area is preserved, the rest is removed.

Operation Soft Shape

Mon, 01 Jan 0001 00:00:00 +0000

Operation Soft Shape

Inputs

float Sdf

float Softness | default 0.1

Behaviour

Turns the signed distance field into a mask with softly feathered edges. Outside of the sdf will be fully black inside will be white and the border transition softly between.

Properties

ESoftShapeFunction SoftShapeFunction | default Smoothstep

With the SoftShapeFunction property one may choose which function to use in order to generate the soft shape.

Linear: the cheapest option, provides a linear gradient over the edge
Smoothstep: good results over all, provides a smooth gradient over the edge.
ExpStep: a faster, yet smooth falloff than Smoothstep
LogStep: an extremely fast falloff

The following figures are at Softness of 0.01.

Operation Smooth Intersection

Mon, 01 Jan 0001 00:00:00 +0000

Operation Smooth Intersection

Inputs

float Left

float Right

float SmoothingFactor | default 0.0

Behaviour

Performs an intersection between two signed distance fields, combining both to a new single output and smoothing the transition by the smoothing factor.

Operation Round

Mon, 01 Jan 0001 00:00:00 +0000

Operation Round

Inputs

float Sdf

float Roundness | default 0.1

Behaviour

Generates a rounded version from the provided signed distance field. The roundness parameter controls how much the signed distance field is rounded.

Operation Subtract

Mon, 01 Jan 0001 00:00:00 +0000

Operation Subtract

Inputs

float Left

float Right

Behaviour

Performs a subtraction between two signed distance fields, Right will be subtracted from Left.

Operation Smooth Subtraction

Mon, 01 Jan 0001 00:00:00 +0000

Operation Smooth Subtraction

Inputs

float Left

float Right

float SmoothingFactor | default 0.0

Behaviour

Performs a smooth subtraction between two signed distance fields, Right will be subtracted from Left. The SmoothingFactor controls how much the resulting transition between subtracted distance fields is smoothed. Higher values mean more smoothing.

Operation Difference

Mon, 01 Jan 0001 00:00:00 +0000

Operation Difference

Inputs

float Left

float Right

Behaviour

Generates the difference between the two provided signed distance fields. Preserves the area where the ingoing signed distance fields are different.