Joe Scarr on PSearch Initiator Nodes Part A

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Cebas Visual Technology

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Published on May 14, 2010 10:00:02 PM ● Video Link: https://www.youtube.com/watch?v=f4u64ngV3k8

Duration: 8:06

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Joe Scarr tutors on PSearch, a feature under Initiator:

- P or Position Search as the name implies allow for 'searches' to be done based on the PID particle positions or by general location

- It can program to search on a particular group and to find out information about that group such as Search within an adjustable radius and specifying sub-tree in a group, if any.

START
- In this tut, you pull out a std red grp;
- Connect red particle to PSearch particle;
- In this example, PSearch grp is the blue grp;
- adjust radius as you need.
- Pull out another std group to represent the 'Found' grp and connect that grp particles to PSeacrh Found PID;
- Adjust up/down radius value to see the changes in the viewport.
- the red particle in this case is PSearching all the blue particles and once found those particles will be sent out to the green group - transforms color into green.

- Go back to your dynamcicSet of Matter waves and Particle draw under Born,
- Joe goes to the Particle Draw under dynamicSet, and Birth another red particle
- adjust particle born on viewport;
- u can see now the red particle will do the search on the blue particles and assign found particles to the green group.
- remove and leave one particle red: activate the red grp 'age' feed,
- connect age to radius, it sill start off and grows or age till particle dies,
- set life span to 999 (under particle draw menu)
- do some thing interesting with the o/p for PSearch - pull out the size function from Std, feed into red particle, ..how many particles does it Search
- feed the PSearch Found Count into the size (in this way the blue particle size will be controlled by how many particles is found)

- R-click Found Count debug: at this point in frame 1 so FCount is '0'
- goes to 43, the red particle size
- this is one wahy to use PSearch o/p to drive further operations
- try feeding Found Indexes to Size instead : debug window is not showing the ID but the indexes like value 0 = particle 1, value 1 = particle 2.... etc.

- Remove group -disable feeds
- try something different: connect Found Density to size: open debug window, found density within radius of 17.154 is 2.50665.... What this value means is that it is the PSearch total Found Count divided by the radius you set.
- Feed Found Density to Size Variation
- Debug window shows a Found Count of 43 : that is 43 / 17.154 is 2.50655

Another case:
- Pull out the Generator Position Born: pipe the PSearch found average position into the PositionBorn, Particle Animation Counter.

- Adjust positionBorn one particle green. Speed variation make 0.
You will see from Viewport, everything centered on that red spot.

- other things you can do are test the PSearch Nearest Distance - feed it to a std grp particle input: select grp green - making it turn green - see viewport
- Viewport shows at frame '0', the nearest particle has turned green so this 1st nearest particle no longer will be search for/ and if you move to the next frame you will see PSearch out the next nearest particles and make it green...and the next and the next
- similar PSearch logic applies to the Found Furthest particle/

Enjoy and thanks for watching!

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