# Scan CHOP and blanking count

Hello!

Wondering if there is a formula that can be used to determine the final point count of a scanned SOP in the Scan CHOP based on the incoming point/prim numbers and the blanking count and vertex repeat parameters. I assume vertex repeat done on the incoming points, not the final “blanked” shape, but I’m curious how many blanking points get added to the scan based on the blanking count. This is all in an effort to achieve an appropriate scan rate for a laser being driven with Etherdream.

Thanks!

P

I suppose the step size parameter also plays a role here. Ideally there is a way compute the number of points per single scan of the input.

So turns out, there was an error in the blanking behaviour, causing repeated ‘on’ points at the end of each polygon.
This is now fixed in build 32120+

The basic sequence is:

1.output blanking points (if turned on)
2.output each vertex of each polygon
3.output first vertex again if polygon is closed

Number of times each vertex is output is Vertex Repeat parameter.
Number of blanking points output is Blanking Count parameter.

Limit Step Size will affect each output point, by dynamically breaking it down into shorter steps.

When using Scan CHOP on a TOP, is there a way to prepare the data where it puts closest neighbors together instead of scanning row by row, line by line?

Here is an example. How do I make scan2 (TOP scan) sort in a similar manner to scan1 (SOP scan)?
Scan_test.2.toe (7.55 KB)

Unfortunately not. Scanning of TOPs uses a pretty simple algorithm.
One thing that may be useful, is using a Trace SOP on the TOP image,
and sending that out instead, possibly sorting it as well with a Sort SOP.
It may produce output as your’e hoping.