Polygonize POP
Summary
The Polygonize POP is an incomplete POP which takes a TOP image, uses it red channel only, makes a 2-point line primitive wherever there is difference in brightness between neighboring pixels relative to a specified threshold between 0 and 1. It can also take a 3D texture in TOPs and convert it to a set of 3D triangles in POPs representing a surface at the black-to-white threshold in the 3D texture.
Its result looks like a trace made up of continuous many-point line strips, but they are actually all separate 1-pixel-length 2-point lines. This may have some use but the full linestrip and triangulated trace will be implemented in the future. Until then, continue to use the Trace SOP, and to make it run faster, include it in an Engine COMP. See the example in the Palette in the Techniques folder.
See also Trace SOP, Engine COMP.
Parameters - Polygonize Page
top - TOP to use as image to polygonize.
threshold - Sets the minimum brightness difference between neighboring pixels required to generate new points.
invert - Invert the TOP pixel or voxel value.
extend - ⊞ - Sets the Extend mode when sampling the TOP.
- Hold
hold-
- Zero
zero-
- Repeat
repeat-
- Mirror
mirror-
fill - Enable the addition of lines for the TOP's contour.
alt - For debugging, will be removed.
cpureadback - Enable copying the point count and topology information held on the GPU to the CPU.
Parameters - Common Page
bypass - Pass through the first input to the output unchanged.
freeextragpumem - Free memory that has accumulated when output memory has grown and shrunk.
delinputattrs - Only output which attributes you specify in this POP - helps isolate attributes into a separate branch.
Info CHOP Channels
Extra Information for the Polygonize 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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