Experimental:Point Generator POP

Summary

The Point Generator POP creates a specified number of points, either randomly or in a pattern, on the surface of shape or within the volume of a closed shape.

The Shape is not a set of polygons (see Sprinkle POP for that) but is a common mathematical shape like a sphere, circle, box, cylinder, torus, rectangle or line, whose shape and position/scale/rotation is controlled with POP parameters.

A menu chooses between points on a surface, or points within its volume.

Volumes should be closed surfaces, but Point Generator still gives a distribution of points around holes of non-closed surfaces.

A Random toggle, when off, gives predictable but patterned distribution of points on/in surfaces.

There are controls of orientation axis and angles of the basic shapes.

Note: Presently there is no option to make the distribution of points be uniform per unit of surface area. For example, triangles get approximately the same number of points on small triangles as on large triangles. (future option)

A Random distribution of points along a line segment in Line mode is controlled with two points in XYZ.

You can add normal (N float3) and tangent (T float4) attribute vectors on points, vertices or primitives, with some choices of further randomization of these attributes.

See also Sprinkle POP, Random POP, Noise POP

pointgeneratorPOP_Class

Parameters - Point Generator Page

Shape shape - ⊞ -

• Sphere sphere -

• Box box -

• Torus torus -

• Tube tube -

• Rectangle rectangle -

• Circle circle -

• Line line -

Create Point Primitives createpointprim -

Number of Points numpoints -

Distribution distribution - ⊞ -

• Volume volume -

• Surface surface -

Random random -

Seed seed -

Orientation orientation - ⊞ -

• XY Plane xy -

• YZ Plane yz -

• ZX Plane zx -

Size size - ⊞ -

• Size size1 -

• Size size2 -

• Size size3 -

Radius radius - ⊞ -

• Radius radius1 -

• Radius radius2 -

• Radius radius3 -

Height height -

Point A pointa - ⊞ -

• Point A pointa1 -

• Point A pointa2 -

• Point A pointa3 -

Point B pointb - ⊞ -

• Point B pointb1 -

• Point B pointb2 -

• Point B pointb3 -

Normal normal - ⊞ -

• None none -

• Point pointNormals -

• Vertex vertNormals -

• Primitive primNormals -

Normal Direction normaldirection - ⊞ -

• Default default -

• Random random -

Tangent dotangent - ⊞ -

• Off off -

• Default default -

• Random to Normal randomtonormal -

• Random random -

Parameters - Transform Page

Transform Order xord - ⊞ -

• Scale Rotate Translate srt -

• Scale Translate Rotate str -

• Rotate Scale Translate rst -

• Rotate Translate Scale rts -

• Translate Scale Rotate tsr -

• Translate Rotate Scale trs -

Rotate Order rord - ⊞ -

• Rx Ry Rz xyz -

• Rx Rz Ry xzy -

• Ry Rx Rz yxz -

• Ry Rz Rx yzx -

• Rz Rx Ry zxy -

• Rz Ry Rx zyx -

Translate t - ⊞ -

• Translate tx -

• Translate ty -

• Translate tz -

Rotate r - ⊞ -

• Rotate rx -

• Rotate ry -

• Rotate rz -

Scale s - ⊞ -

• Scale sx -

• Scale sy -

• Scale sz -

Pivot p - ⊞ -

• Pivot px -

• Pivot py -

• Pivot pz -

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 Point Generator 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.

Operators that do not need any inputs connected are called Generators in TouchDesigner, like a Pattern CHOP. See Filter.

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.

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").

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.