Experimental:Curve POP

Summary

The Curve POP can be used to generate a curve in XY (Z=0) that can be used as a lookup curve for a Lookup Attribute POP or elsewhere. It is a "function" in that the P(0) X value steps forward uniformly, while the P(1) Y value takes on different interpolated shapes.

Like the S Curve CHOP, it defaults as an Ease In Ease Out curve, but the Curve POP has multiple segments (sequential blocks) that can create a greater range of curves. The curve can be made of several segments defined by Sequential Blocks of parameters, each with its own start and end values and Curve Type.

The Curve Type include Constant, Linear, Eases and Bezier.

The Alpha and Beta values affect the curve, where Alpha makes it more or less sloped, and Beta makes it more biased to the start or end of the segment. When Bezier is selected, Slope In and Slope Out affect the slopes at the end-points of the segment.

More generally, we treat the 2 axes as U and V. The curves can output as points-only, a linestrip, or as an RGBA color curves.

Because the U values can start and end at any value, your can normalize the curve so the U values (P(0)) are between 0 and 1.

The curve can be extended to double length and made symmetric using the Symmetric toggle.

The Lookup page lets you apply the curve as a lookup without first converting anything to points. This preerves maximum accuracy, and avoinds interpolation problems when a lookup curve sharply steps from one value to another as may occur between two segments. IN this case you attach an input POP where you want to modify one or more attributes with the curve. In this mode it behaves similar to the Lookup Attribute POP.

Tip: If you want specific points to exactly hit your U keyframe values, make sure your (Number of Points - 1) is divisible evenly by your U values.

curvePOP_Class

Parameters - Curve Page

Total Length totallength -

Output Curve outputcurve - ⊞ -

Points points -

Line Strips linestrip -

Color Strip colorstrip -

Normalize U normalizeu -

Symmetric symmetric -

Parameter Size parsize - ⊞ -

1 1 -

2 2 -

3 3 -

4 4 -

Start U startu -

Segment seg -

Curve Type seg0type - ⊞ -

Constant constant -

Linear linear -

Ease In easein -

Ease Out easeout -

Ease In Ease Out easeinout -

Bezier bezier -

U seg0u -

Specify Start Value seg0specstartval -

Start Value seg0startval -

End Value seg0endval -

Alpha seg0alpha -

Beta seg0beta -

Slope in seg0slopein -

Slope Out seg0slopeout -

Parameters - Lookup Page

Apply Lookup applylookup -

Lookup Index Attribute lookupindexattr -

From Low High fromlow -

From High fromhigh -

To Low High tolow -

To High tohigh -

Extend Left and Right extendleft - ⊞ -

Hold hold -

Slope slope -

Cycle cycle -

Mirror mirror -

Extend Right extendright - ⊞ -

Hold hold -

Slope slope -

Cycle cycle -

Mirror mirror -

Lookup lookup -

Multiply lookup0multiply -

Add lookup0add -

Combine Operation lookup0combineop - ⊞ -

Set set -

Add add -

Multiply mult -

Minimum min -

Maximum max -

Output Attribute Scope lookup0outputattrscope - ⊞ -

P P -

N N -

Color Color -

Color.i012 Color.i012 -

Tex Tex -

PointScale PointScale -

LineWidth LineWidth -

Override Automatic Attribute lookup0overrideautoattr -

New Attribute Type lookup0newattrtype - ⊞ -

float float -

double double -

int int -

uint uint -

dir dir -

dbl dir ddir -

New Attribute Number of Components lookup0attrnumcomps - ⊞ -

1 1 -

2 2 -

3 3 -

4 4 -

New Attribute Default Value lookup0newattrdefaultval - ⊞ -

New Attribute Default Value lookup0newattrdefaultval1 -

New Attribute Default Value lookup0newattrdefaultval2 -

New Attribute Default Value lookup0newattrdefaultval3 -

New Attribute Default Value lookup0newattrdefaultval4 -

Parameters - Common Page

Bypass bypass -

Delete Input Attributes delinputattrs -

Operator Inputs

Input 0: -

Info CHOP Channels

Extra Information for the Curve 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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