Joe Scarr Tutorial on Initiators - PPass, PPassAB, PSelection 1 of 2

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Cebas Visual Technology

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Published on May 14, 2010 9:59:23 PM ● Video Link: https://www.youtube.com/watch?v=sLgZ28fElm8

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Tutorial

Duration: 7:36

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5

ThinkingParticles foundational tutorial by Joe Scarr.

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These tutorials continue to be very useful to trainees and users of TP 6.

The TP initiator is a very special category:
In this Tutorial, Joe Scarr starts by looking at PPass, PPassAB, PSelection (under Create (right menu) - Initiator).

* Please note that Initiator and PSearch have been covered in earlier tutorials - search the videos.

- PPass is a simple holder for a particle group. On the screen - the dynamicSet shows a PPass since the group is listed as 'none'.
Select a 'group' - e.g. red and the PPass header will show up as red (red particles). You can decide which set of particles - the red / blue or green that your VFX would like to affect.

- Doing the above action is same as clicking on the group under Create menu (the one with + signs) and dropping a red.

(Straightforwardly, that is what PPass activates.)

Coming to PPassAB: this is a method for comparing particle groups signified here as grp A vs grp B.

- PPassAB helps to vfx 2 groups of particles coming close to each other and what will happen.

- From Operators (menu to the right) pull out a red and a green group and bring out the 'position' plugs. U can compare their position information for a fx scene, for example,
- Now the two operators the red and green will act in parallel as u select, but their information (position for this example) is not going to be synchronize.
- To sync, u have to line them up say, in a series or connect a parent-child relationship to the two grps, with the latter in a child dynamicSet.

- PPassAB gets things done without doing the series link / parent-child thing and here's how:
- Under PPassAB : Grp A will the group that you're most concern with - that is, the main group. Red in this example.
- Grp B is then the green.
- Select 'Shooter' (right menu where u had selected the 'group')
- Pull out two shooters.
- we're going to turn on a disabled blackbox - not sure what this is? See http://cebas.com/index.php?pid=blackboxes)

_ Left bar: we see Shooters -- dynamicSet and under that the PPassAB
- move the animation cursor and see what happens when the red and green compare with each other:
- Select from the blackBox (menu to the right) the MD3_Vectors and then pull out the vAvg2.
- On the PPassAB: drop the menu and exposed the Particle and Position for both the A and B
- to establish the feeds logically, first connect feed A-Position to v1 under vAvg2 and the v2 to B-Position.
- Right menu: Operators -- feed into a PositionBorn.
- Select Born blue (particle) 1 pistol shot per call. Speed: 0; life span: 999.
- Feed the vAvg2 output v3 to positionBorn's Position
- Look at the menu PPassAB the settings 'all' and this means every red particle will do a comparison with every green particle;
-Play the animation and u see the example onscreen of the one red particle comparing with the one green particle and averaging birthing the blue particles: increase the number of particles.
- Note that with the vAvg2 feeds, each and every red/green particle will do a comparison across to every emitting particles across the line and birth blue particles (average)
- all happens in one time sample
- Scrub it out and u will see lines of blue particles being born alongside the previous line as the particles compare/average out.
- soon u will see a large set of blue particles being born, especially since their life span is set at 999
- Now try setting the PPassAB setting 'distance' to 20 units.
- By setting 20, this means when a red particle is at a distance of 20 from a green particle then o/put a blue one.
- Joe changed it to distance 30 units - scrub and see what happens.
-Take a look at the menu setting: 'only the nearest' - this means a blue is born only when a red compares with its nearest green, but not the rest.
- menu setting: 'only the furthest' - this means a blue is born only when a red compares with its furthest green, but not the rest.
- And menu setting to both: 'only the nearest, and furthest' - this means two blues are born only when a red compares with its nearest and furthest green, but not the rest.

- if u select 'particle size'. scrub and see what happens - red overlaps green and birth a blue.

- if u select 'particle shape collision', (pls go to Tutorial 2 of 2 next)

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