Math Mix POP

Summary

The Math Mix POP can do a series of math operations in one node. It is a simpler version of the Math Combine POP. Each sequential block on Math Mix's Combine page is an operation that can combine one, two or three attributes. There are over 70 different operations to choose from, such as A + B, sin(A), or mix(A, B, C). Scope A, Scope B and Scope C are parameters containing attribute names of the incoming POPs.

Handling Inputs: It allows multiple inputs, but unlike Math Combine, all inputs' attributes are auto-named. The first input's attributes have their names unchanged, but the second input's attributes are prefixed with in1_, such as in1_Tex. Attribute names are prefixed with in2_ etc for the other inputs. These attribute names appear in the menus to the right of each Scope A B and C on the Combine page.

On the Inputs page, Math Mix lets you choose whether you are operating on point, vertex or primitive attributes.

Inputs that are a single-point are treated as constant values and can be combined with multi-point POPs.

Otherwise, when the input's sizes (number of points) don’t match, it gives you a choice of erroring, warning or ignoring the mis-match, and a choice of how to make them align.

Combine page (same for both Math Combine and Math Mix):

Each sequential block is like a mini-equation that lets you operate on one, two or three attributes, and put the result in the same or another attribute.

• Operation - There are over 70 possible operations.
• Scope A - an attribute, or components of attributes like P(1) P(2), or its equivalent P.yz
• Scope B - an attribute (if applicable)
• Scope C - an attribute (if applicable)
• Result Scope (an existing attribute name, components, or a new attribute name)

For A, B and C you can also put constant numbers, or constant vectors like .3 .4 .5.

Also on the Uniforms page you can specify temporary attributes that have constant values that also can be used on the Combine page.

Scope A, B or C can contain an attribute name, or individual "components" of a "vector attribute". A vector attribute is a 2- 3- or 4-value attribute. (e.g. The second component of a float3 vector .3 .4 .5 is .4.)

Since we can put in the Scope A, B or C things like P(0) P(2) N(0), you can actually mix and reorder components and put the results in any (other) component combination of one attribute.

Attribute menu - From the Scope A, B and C's menu on their right you can choose from the incoming attributes, the new attributes you created in Math Mix, and also via the > at the bottom of the menu the set of very useful built-in attributes (they all start with a _. Built-in attributes include the point index, normalized indexes, the time slice step time, Pi (3.14157), Dimensions, number of points, etc.

The Result Scope parameter directs the results of an operation to an attribute. You specify the name of the attribute you want to create or over-write, and it will do its best to figure out its properties - type and size. It visually shows in italics what attribute that a block would be writing to, without you explicitly specifying.

It handles combining floats with floats, floats with vectors, and vectors with vectors.

You can specify groups of points/vertices to operate on, others being untouched or left at default values.

Output page - lets you keep or delete temporary attributes:

• • Delete Attributes - which ones to delete from the output
  • Delete New Attributes toggle

Note that on the Common page you can select to output only the attributes that were affected in the POP, useful for cases where you want to output one attribute per POP.

Pseudocode - Note the pop-up info (middle-click on the node) contains pseudocode of the operations in this POP, for easier understanding of what the POP is doing.

Angles are in degrees, but the Angle Units menu parameter lets you express angles in radians, cycles or degrees.

It uses the primitives and vertices of the first input and other inputs' primitives and vertices are ignored.

Optimized - Note that any attribute you select on the Inputs page does not copy the attribute data - it remains as a reference to the attribute arrays of the incoming POPs.

Attaching an Info DAT will show you raw GLSL code that is generated.

See also Math Combine POP, Math POP, ReRange POP, Quantize POP, Limit POP

See also Experimental:Math Mix Combine Functions

mathmixPOP_Class

Parameters - Inputs Page

Parameters - Uniforms Page

Parameters - Combine Page

Parameters - Output Page

Parameters - Common Page

Operator Inputs

• Input 0: -

Info CHOP Channels

Extra Information for the Math Mix 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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