Experimental:Attribute POP

Summary

The Attribute POP lets you:

• Create new attributes
• Rename attributes
• Duplicate attributes
• Delete attributes
• Create matrix attributes

When you create a new attribute, you specify:

• the name (choose from built-in pre-defined names, or create your own)
• the type (float, double, int, uint)
• the number of components in the attribute (1, 2, 3 or 4 only). Examples:
  • A float type with 3 components is therefore a float3.
  • A double with 2 components is a double2.
  • An int with 4 components is an ivec4.
  • A uint with 3 components is a uint3.
• arrays of the above, for example create a array of 8 float3, appearing as float3[8]. The array length can be anything.
• the default value for each component of the attribute

New attributes can also be matrices (done on the Matrix page), like creating a mat4x4.

attributePOP_Class

Parameters - Create Page

Attribute Class attrclass - ⊞ -

• Point point -

• Vertex vertex -

• Primitive primitive -

Group group -

Notification if Attribute Exists notificationifexists - ⊞ -

• Ignore ignore -

• Warning warning -

• Error error -

Override if Attribute Exists overrideifexists -

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 -

Array attr0isarray -

Array Size attr0arraysize -

Value attr0value - ⊞ -

• Value attr0valuer -

• Value attr0valueg -

• Value attr0valueb -

• Value attr0valuea -

Parameters - Matrix Page

Matrix Attribute mat -

Matrix Name mat0name -

Rows mat0numrows -

Columns mat0numcols -

Array mat0isarray -

Array Size mat0arraysize -

Qualifier mat0qualifier - ⊞ -

• None none -

• Transform Matrix transformMatrix -

Parameters - Rename Page

Rename Attribute ren -

From Attribute ren0from -

To Attribute ren0to -

Parameters - Duplicate Page

Duplicate Attribute dup -

Duplicate Attribute dup0name -

New Attribute Name dup0new -

Parameters - Delete Page

Delete Point Attributes ptdel - ⊞ -

• * * -

Delete Vertex Attributes vertdel - ⊞ -

• * * -

Delete Primitive Attributes primdel - ⊞ -

• * * -

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 Attribute 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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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 sequence of vertices form a Polygon in a SOP. Each vertex is an integer index into the Point List, and each Point holds an XYZ position and attributes like Normals and Texture Coordinates.

A surface type in SOPs that includes polygon, curve (NURBS and Bezier), patch (NURBS and Bezier) and other basic shapes like sphere, tube and metaball. Points and Primitives are part of the Geometry Detail, which is a part of a SOP.

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.

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

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").

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.