hm_collisiongetconfig

Returns flags to be used for configuration of the collision detection.

Syntax

hm_collisiongetconfig keyword1 ?keyword2? ... ?keywordN?

Type

HyperMesh Tcl Query

Description

Converts keywords into a numerical value for the configuration of the collision detection module. The returned value is used for the config argument to hm_collisioninit or *collisioncheck2_temp.

One or more keywords can be provided. Valid keywords are:

Inputs

The following inputs are applicable to hm_collisioninit and *collisioncheck2_temp:

intersect_planar: If listed, consider coplanar facets which are partially/fully overlapping, within a given tolerance defined by hm_collisoininit, as intersected.; If not listed, do not consider these planar intersections (default for opcode engine). This is ignored by the collirad engine.
penetrat_min_overlap: If listed, consider only penetrations between two facets if they have an overlap greater than a given tolerance defined by hm_collisioninit (not compatible with the collirad engine).; If not listed, such penetrations are even reported if a node of one of the facets penetrates exactly onto the edge of the other facet (default).; This is ignored if any of the options edge_penetration, midside_nodes or split_quads are used in hm_collisionentitycreate.

The following inputs are applicable to hm_collisioninit only:

collirad: If listed, switches to the collirad collision detection engine, which is mainly based on Radioss algorithms, and provides an automatic fix.; If not listed, the default opcode collision detection engine is used, which supports some additional options, but does not support an automatic fix.

The following inputs are applicable to *collisioncheck2_temp only:

constant_gap: If listed, the thickness argument of *collisioncheck2_temp is used as a constant/uniform thickness. This is equivalent to passing thickness_type 0 to hm_collisionentitycreate.; If not listed, the thickness argument of *collisioncheck2_temp is used as a multiplier for the element thickness when using the collirad engine, or ignored when using the opcode engine
edge2edge: If listed, edge-to-edge penetrations are considered. This is equivalent to the edge_penetration flag in hm_collisionentitycreate.; If not listed, only node-to-surface penetrations are considered.
intersections: If listed, intersections are checked.
neighborhood: If listed, configures the collirad penetration check to ignore penetrations of neighboring elements due to thicknesses being greater than element sizes. This corresponds to using the Iremgap 2 option in Radioss contact interfaces.; This is also equivalent to adding 100 to thickness_type for hm_collisionentitycreate.; If not listed, such undesired penetrations may be reported, but the check is faster.; This is ignored for the opcode engine.
penetrations: If listed, penetrations are checked.
self: If listed, include self checks in *collisioncheck2_temp. This is equivalent to the self_check flag in hm_collisioncheck.; If not listed, self checks are not included (not compatible with the colirad engine).
thick_reduction: If listed, configures the collirad penetration check to restrict the thicknesses of the elements to 40% of their size each. This also avoids undesired penetrations of neighboring elements due to thicknesses being greater than element sizes. This corresponds to the behavior of some Radioss contacts.; This is equivalent to adding 200 to the thickness_type argument for hm_collisionentitycreate.; Ignored for the opcode engine.

Example

To configure the collision detection for planar intersections:

set config [hm_collisiongetconfig intersect_planar]
hm_collisioninit $config

Errors

Incorrect usage results in a Tcl error. To detect errors, you can use the catch command:

if { [ catch {command_name...} ] } {
   # Handle error
}

Version History

14.0

2017.1 - Updated the option descriptions to indicate their support for the opcode vs. collirad engines, and the hm_collisioninit and *collisioncheck2_temp commands. Added constant_gap, edge2edge, intersections, neighborhood, penetrations, self and thick_reduction options for *collisioncheck2_temp.