Experimental:CHOP to POP

Summary

The CHOP to POP takes CHOP channels and lets you convert them to attributes of a POP. Each CHOP sample becomes one POP point.

You can manually list the CHOP channels you want to convert, and then list the names of the POP attributes you want create, matching channels to attributes one by one. Built-in attributes like P, N, Color and Tex are assumed to be their multi-component forms. Other channel names will be assumed to be converted to scalar float attributes.

Channel to attribute mapping can be done through sequential blocks which give you more control over the type of attribute you create, for example, an array of 5 integers.

Alternately, channels can be automatically converted to attributes based on a naming standard. Set the Channels Selection menu to Autoconvert Precise Names. This is the same channel naming standard that POP to CHOP produces when POP to CHOP's Name Format menu is set to Precise, which handles attributes that have () and []:

• the attribute name is the same including maintaining capital letters
• components of a vector attribute have _0 _1 _2 suffixed i.e. Tex_0 Tex_1 Tex_2
• arrays are represented with a leading-following underscore - MyArray_0_ and for vector arrays MyVectorArray_0_1.
• The channel name optionally has a single character at the end to signify data type: f (float), F (double), i int, I double int, u unsigned, U double unsigned.

You can get the P position attribute from the CHOP, or you can create your own line for P with a start-end position that you specify.

The POP points can be connected as an open or closed linestrip, or be created as single-point primitives, or have no primitives.

You can override the number of points that it produces and CHOP to POP will optionally interpolate from samples of the input.

See also POP to CHOP

choptoPOP_Class

Parameters - CHOP to Page

CHOP chop -

Connectivity surftype - ⊞ -

• None none -

• Line Strip linestrip -

• Lines lines -

• Point Prims points -

Override Number of Points overridenumpoints -

Number of Points numpoints -

Interpolate interpolate -

Specify Position specifypos -

Start Position startpos - ⊞ -

• Start Position startposx -

• Start Position startposy -

• Start Position startposz -

End Position endpos - ⊞ -

• End Position endposx -

• End Position endposy -

• End Position endposz -

Closed closed -

Channel Scope chanscope -

Attribute Scope attrscope - ⊞ -

• P P -

• P(0) P(0) -

• P(1) P(1) -

• P(2) P(2) -

• Color Color -

• Color(0) Color(0) -

• Color(1) Color(1) -

• Color(2) Color(2) -

• Color(3) Color(3) -

• N N -

• N(0) N(0) -

• N(1) N(1) -

• N(2) N(2) -

• Tex Tex -

• Tex(0) Tex(0) -

• Tex(1) Tex(1) -

• Tex(2) Tex(2) -

New Attribute attr -

Channel Scope attr0chanscope -

New Attribute Name attr0name - ⊞ -

• Custom custom -

• P p -

• N n -

• Color color -

• Tex tex -

• PointScale pointscale -

• LineWidth linewidth -

Custom Name attr0customname -

New Attribute Type attr0type - ⊞ -

• float float -

• double double -

• int int -

• uint uint -

• vector vector -

• dvector dvector -

• dir dir -

• dbl dir ddir -

New Attribute Number of Components attr0numcomps - ⊞ -

• 1 1 -

• 2 2 -

• 3 3 -

• 4 4 -

New Attribute Default Value attr0defvalue - ⊞ -

• New Attribute Default Value attr0defvalue1 -

• New Attribute Default Value attr0defvalue2 -

• New Attribute Default Value attr0defvalue3 -

• New Attribute Default Value attr0defvalue4 -

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.

Info CHOP Channels

Extra Information for the CHOP to 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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An Operator Family which operate on Channels (a sequence of numbers (Samples)) which are used for animation, audio, mathematics, simulation, logic, UI construction, and data streamed from/to devices and protocols.

Each SOP has a list of Points. Each point has an XYZ 3D position value plus other optional attributes. Each polygon Primitive is defined by a vertex list, which is list of point numbers.

A parameter in most CHOPs that restricts which channels of that CHOP will be affected. Normally all channels of a CHOP are affected by the operator. TOPs have Channel Mask, a similar feature.

An operator whose Bypass flag is set does nothing: All data going into its first input appears at its output unaffected.

Information associated with SOP geometry. Points and primitives (polygons, NURBS, etc.) can have any number of attributes - position (P) is standard, and built-in optional attributes are normals (N), texture coordinates (uv), color (Cd), etc.

A Link. The grey dashed lines between nodes is a Reference or Link that indicates one operator is getting data from another operator from any Operator Family.

The grey dashed lines between nodes is a Reference (or Link). A Reference is (1) a Parameter Reference, a parameter in an OP that is a name or path to another operator, (2) a Node Reference, an expression in a parameter or DAT script that contains the name or path of another operator, (3) a DAT Cell Reference or (4) a CHOP Channel Reference.

A Link or Reference is a dashed line between nodes that represent other data flowing between nodes. Examples are CHOP Exports, node Paths in parameters, and expressions in parameters referencing CHOP channels, DAT tables and other nodes. In contrast is a Wire that connects nodes in the same Operator Family.

A parameter reference can be setup between any two parameters by putting an expression in one parameter that refers to another parameter. This creates a Link between the two parameters such that when one changes, the other will change automatically (known in other software as a "constraint").