Experimental:Line POP

Summary

The Line POP generates a line strip where you create a set of points using parameters, and then subdivide each segment using various interpolation methods. The default is two points with 20 divisions between them, linearly interpolated.

You add a point by creating a new sequential block on the Points page and specifying the position P using its parameters. But each point can have any set of attributes: On the Setup page, use New Attribute to define all the attributes you want for the points.

The points are automatically connected as a line strip. On Setup, you can choose the Interpolation Method for the Divisions page, the default being Linear interpolation, but also possible are splines including Cardinal, BSpline, Beziers and Quadratic. With the spline types, the Line POP adds extra parameters on the Point page for setting the spline weight, tangents and/or tension. You can also choose to have a different interpolation method per-point.

On the Setup page, the toggle Multiple Line Strips lets you break the points into separate line strips, thus a parameter is added to the Points' sequential block that lets you indicate where the line breaks are. Also points can be repeated, and line strips can be open or closed.

The Divisions page subdivides the line strips in two stages. The first stage allows setting the total divisions for the line strip, or the divisions per-segment, or lets you divide by distance along the curves. The second stage lets you further re-sample the line strip, adding or removing points.

If you want to output your pre-divided point list, then do some other operations on it with other POPs, and then divide using the Line Divide POP, you can output the line strip(s) of the Line POP with the necessary attributes to be used by the Line Divide POP to control the divisions, including the interpolation type (SegMethod, in integer form). SegMethod is 0 for Linear, 1 for Cardinal and so on following the order in the Interpolation Method menu. It will also output attributes for weight and tangents etc. Look at the mclick popup info box to see the attributes it outputs.

linePOP_Class

Parameters - Setup Page

Multiple Line Strips multiplelinestrips -

Interpolation Method per Segment interpmethodpersegment -

Interpolation Method interpmethod - ⊞ -

Linear linear -

Cardinal (Interpolating) cardinal -

BSpline bspline -

Cubic Bezier With Tangents cubicbeziertang -

Cubic Bezier cubicbezier -

Quadratic Bezier quadraticbezier -

Tension tension -

Enable Weights enableweights -

Enable Tangents enabletangent -

Enable Point Repeat enablepointrepeat -

Closed closed -

Pre-Multiply RGB by Alpha premultcolor -

New Attribute attr -

Name attr0name - ⊞ -

Custom custom -

N n -

Color color -

Tex tex -

PointScale pointscale -

LineWidth linewidth -

Custom Name attr0customname -

Type attr0type - ⊞ -

float float -

double double -

int int -

uint uint -

dir dir -

dbl dir ddir -

Number of Components attr0numcomps - ⊞ -

1 1 -

2 2 -

3 3 -

4 4 -

Default Value attr0value - ⊞ -

Default Value attr0valuer -

Default Value attr0valueg -

Default Value attr0valueb -

Default Value attr0valuea -

Parameters - Points Page

Point pt -

Position pt0pos - ⊞ -

Position pt0posx -

Position pt0posy -

Position pt0posz -

Position pt1pos - ⊞ -

Position pt1posx -

Position pt1posy -

Position pt1posz -

Parameters - Divisions Page

Output output - ⊞ -

Subdivided Lines subdivlines -

Control Points ctrlpoints -

Divisions Method divmethod - ⊞ -

Divisions per Line Strip linestrip -

Divisions per Segment segment -

Divisions Defined per Segment defpersegment -

Distance between Points (per Segment) distseg -

Divisions divs -

Distance dist -

Add ControlPoint Attribute addctrlpointattr -

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 - ⊞ -

P(0) P(0) -

Independant Variable Step indvarstep -

Maximum Number of Vertices resamplemaxverts -

Max Tries for Binary Search maxtries -

Parameters - Common Page

Bypass bypass -

Delete Input Attributes delinputattrs -

Info CHOP Channels

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

Common POP Info Channels

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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