[x3d-public] Geometry Collectors

[GPU Group]

On each frame, 2 steps currently
1. emitter - emits more particles in some pattern
2. particles - iterate over particles, updating each based on some
projectile math
With a broom / rake collector, add another step
3. collector - iterate over particles again, updating each for frame sweep
of broom, with different math, in case affected.


On Sat, Mar 19, 2022 at 10:47 PM John Carlson <yottzumm at gmail.com> wrote:

> I am now considering rakes and brooms as collectors.   I’m not sure if
> that helps or not.
>
> On Sat, Mar 19, 2022 at 7:49 PM GPU Group <gpugroup at gmail.com> wrote:
>
>> But what would the step calculation look like for a complex street /
>> plaza scenario? For example if there are sidewalks and off limits grass
>> areas and fountains obstructing paths?
>> One idea is a cellular grid. To initialize, each collector would
>> flood-fill a grid of values incrementally, with the distance to the
>> collector, and on each flood step would increment the distance value by a
>> grid cell value, and when hitting a barrier, would leave those values at
>> infinity. If a grid cell is already flood filled, it isn't over-written, so
>> the shortest distance is preserved.
>> Then the agent step algorithm would look at the grid for its destination
>> collector, and step in the direction with the shortest distance to the
>> collector.
>>
>> On Sat, Mar 19, 2022 at 1:04 PM GPU Group <gpugroup at gmail.com> wrote:
>>
>>> In particle emitters, the step formula guides, based on previous
>>> location, and trajectory, and physics formula.
>>> For humanoid-agent emitters and collectors, each particle/humanoid-agent
>>> is assigned a target collector by some formula -random assignment or share-
>>> and the step formula would be based on previous location, target collector
>>> location, and path optimization formula such as object avoidance, social
>>> distancing, walk-light rule obedience, and effort/time minimization. Unlike
>>> particles which are created and possibly destroyed, the humanoid agents
>>> would be recycled after being collected, they would be re-emitted from a
>>> nearby emitter, with new or reversed target.
>>>
>>> On Sat, Mar 19, 2022 at 12:52 PM John Carlson <yottzumm at gmail.com>
>>> wrote:
>>>
>>>> There should be collectors of geometry.   Perhaps time-based groups or
>>>> transforms?   Define “meeting” in X3D?   How does Office Towers do it?
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>>>
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