Experimental:Line Divide POP

Summary

The Line Divide POP takes any set of line strips, and for each it generates a new line strip that is subdivided using various interpolation methods. The default is linear interpolation with 4 divisions between incoming points.

You can choose the Interpolation Method, the default being Linear interpolation, but you can also choose spline types like Cardinal, BSpline, Beziers and Quadratic. With the spline types, it can use incoming attributes (like those set in the Line POP) that specify the spline properties like Weight, tangents (TanIn and TanOut), tangent constraints (TanInConstraint) and/or tension. It will also interpret an interpolation method per-point if a SegMethod attribute exists.

There are two stages of doing divisions, The first stage allows setting the total divisions for the line strip, or divisions per-segment, dividing by distance along the curves, or by curvature of the line strip. It interpolates all the attributes.

The second stage lets you further re-sample the line strip with one of three methods: Divisions per Line Strip, Distance between Points, or Points as Keyframes.

Points as Keyframes interpolates by treating one attribute as an independent variable (like Time, or U), like a y = f(x) mathematical function. (For example, if you have an attribute Time on the points, you can resample curves at equal steps of time, assuming you curves express values over time.)

NOTE: The Maximum Number of Vertices parameter is required because it is not known on the GPU how many points you will end up with, and the GPU needs to pre-allocate enough memory to do the job. Oherwise line strips will be truncated.

To add: distinguish the different beziers, explain TanInConstraint. ControlPoint attribute (laser)

See also Line POP, Curve POP, Point POP, Primitive POP, Pattern POP.

linedividePOP_Class

Parameters - Line Divide Page

Interpolation Method per Segment interpmethodpersegment -

Segment Method Attribute segmethodattr -

Interpolation Method interpmethod - ⊞ -

• Linear linear -

• Cardinal (Interpolating) cardinal -

• BSpline bspline -

• Cubic Bezier With Tangents cubicbeziertang -

• Cubic Bezier cubicbezier -

• Quadratic Bezier quadraticbezier -

Weight Attribute useweight -

Weight Attribute Name weightattr -

In Tangent Attribute usetanin -

In Tangent Attribute Name taninattr -

Out Tangent Attribute usetanout -

Out Tangent Attribute Name tanoutattr -

In Tangent Constraint Attribute usetaninconst -

In Tangent Constraint Attribute Name taninconstattr -

Clamped clamped -

Tension tension -

Divisions Method divmethod - ⊞ -

• Divisions per Line Strip linestrip -

• Divisions per Segment segment -

• Distance between Points dist -

• Distance by Curvature curvature -

Divisions divs -

Min Distance mindist -

Max Distance maxdist -

Min Max Bias minmaxbias -

By Edge byedge -

Add ControlPoint Attribute addctrlpointattr -

Maximum Number of Vertices maxverts -

Post-Resample Method resamplemethod - ⊞ -

• None none -

• Divisions per Line Strip linestrip -

• Distance between Points dist -

• Points as Keyframes keyframes -

Divisions resampledivs -

Distance resampledist -

Independant Variable Attribute indvarattr -

Independant Variable Step indvarstep -

Maximum Number of Vertices resamplemaxverts -

Max Tries for Binary Search maxtries -

Remove Unused Points rmvunusedpts -

Parameters - Common Page

Bypass bypass -

Delete Input Attributes delinputattrs -

Parameter Color Space parmcolorspace - ⊞ - Controls how all color parameters on this node are interpreted. The color values as treated as being in the selected color space, and are converted to the Working Color Space before they are used as part of the node's operation. Note that this does not change the color space of the node itself, as that is always in the Working Color Space.

• sRGB srgb - sRGB color space, with sRGB transfer function. Considered an SDR color space with respect to Reference White.

• sRGB - Linear srgblinear - sRGB color space, with linear transfer function. Considered an SDR color space with respect to Reference White.

• Rec.601 (NTSC) rec601ntsc - Rec.601 with NTSC primaries color space, with Rec.601 transfer function. Considered an SDR color space with respect to Reference White.

• Rec.709 rec709 - Rec.709 color space, with Rec.709 (same as Rec.2020) transfer function. Considered an SDR color space with respect to Reference White.

• Rec.2020 rec2020 - Rec.2020 color space, with Rec.2020 (same as Rec.709) transfer function. Considered an HDR color space with respect to Reference White.

• DCI-P3 dcip3 - DCI-P3 color space, with D65 white point and 2.6 gamma transfer function. Considered an HDR color space with respect to Reference White.

• DCI-P3 (D60) dcip3d60 - DCI-P3 "D60 sim" color space, with D60 white point, and 2.6 gamma transfer function. Considered an HDR color space with respect to Reference White.

• Display-P3 (D65) displayp3d65 - Display-P3 color space, with D65 white point, and sRGB gamma transfer function. Considered an HDR color space with respect to Reference White.

• ACES2065-1 aces2065-1 - ACES 2065-1 (also known as ACES AP0) color space, with a linear gamma transfer function. Considered an HDR color space with respect to Reference White.

• ACEScg acescg - ACEScg (also known as ACES AP1) color space, with a linear gamma transfer function. Considered an HDR color space with respect to Reference White.

• Passthrough passthrough - When selected, the color values will be used as-is in the operation, without any modification or attempt to convert them into the Working Color Space.

Parameter Reference White parmreferencewhite - ⊞ - When converting a parameter color value to the Working Color Space, this controls how it should be treated with respect to Reference White. If the Working Color Space is the same Reference White, then no adjustment is done. If they are different, then the Reference White level (brightness) of this color will be adjusted to the range expected by the Working Color Space. For example if the project is set to have a SDR Reference White of 120 nits, and the HDR Reference White is 80 nits, then a color of (1, 1, 1), which is 120 nits in the SDR color space, will be converted to be (1.5, 1.5, 1.5), which is 120 nits still in the HDR Working Color Space.

• Default For Color Space default - Will use either the SDR or the HDR Reference White, based on the color space selected.

• Standard (SDR) sdr - Will treat the Parameter Color Space as SDR for it's reference white value.

• High (HDR) hdr - Will treat the Parameter Color Space as HDR for it's reference white value.

Operator Inputs

• Input 0: -

Info CHOP Channels

Extra Information for the Line Divide POP can be accessed via an Info CHOP.

Common Operator Info Channels

• total_cooks - Number of times the operator has cooked since the process started.

• cook_time - Duration of the last cook in milliseconds.

• cook_frame - Frame number when this operator was last cooked relative to the component timeline.

• cook_abs_frame - Frame number when this operator was last cooked relative to the absolute time.

• cook_start_time - Time in milliseconds at which the operator started cooking in the frame it was cooked.

• cook_end_time - Time in milliseconds at which the operator finished cooking in the frame it was cooked.

• cooked_this_frame - 1 if operator was cooked this frame.

• warnings - Number of warnings in this operator if any.

• errors - Number of errors in this operator if any.

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