yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

> To summarize:
>
> 1. Colliders:
> a) create potential (isNew !isReal) interactions, for overlapping AABBs
> b) delete interactions that were potential (isNew&!isReal) but now 
> don't have overlapping AABBs
> c) keep isReal interactions (regardless of geometrical overlap)
>
> 2. InteractionGeometryMetaEngine:
> a) set isReal on interactions that are real (bodies collide not only 
> with AABBs, but also with their volumes)
>
> 3. ConstitutiveLaws
> a) may set !isReal, they do not change anything else (let alone 
> deleting interactions directly!)
Perfect!


> Remaining problem: who deletes interaction that was ever only 
> potential and now there is no AABB overlap anymore? It would have to 
> keep track of when was the interaction seen last (something like 
> Interaction::cycle). I propose long Interaction::lastSeen for 
> iteration number. All interactions that are isNew && !isReal && 
> lastSeen<currentIteration can be deleted safely. Whould that be OK? 
> Currently, PersistentSAPCollider sets isReal=false at the beginning of 
> the loop.

Mmmh... Is there really a problem here? What is the difference with 1.b) 
above?
You can let the collider delete those interactions, disregarding the 
"lastseen" iteration.
PersistentSAPCollider is NOT reseting isReal for the case we are 
discussing :
/
if(!haveDistantTransient) I->isReal=false;/

This is the only place where isReal can be set false if it is not set in 
the constitutive law (e.g. ElasticContactLaw).
This line will be totally removed eventually, when the 
haveDistantTransient behaviour will be the default. Or perhaps this line 
will be left here and only the default value of hDT will be changed to 
keep both behaviours possible?

Bruno


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Chareyre Bruno
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