RobotArm "base" mesh registers collisions even when Blacklisted.

[InfraredLaser]

When running the example RobotArm python script, I noticed that the "base" mesh still registers collisions when the simulator is running. Under the .json file I noticed that this mesh should be blacklisted (code below), yet it sill registers collisions. The .json file that I ran is the default given in the example.

Settings: Windows 10, UE 4.24.3, vs2017

"UrdfBot": {
          "VehicleType": "UrdfBot",
          "DebugSymbolScale": 5,
          "CollisionBlacklist": [
              {
                  "BotMesh": "base", 
                  "ExternalActorRegex": "Ground"
              }
          ],

[mitchellspryn]

Which meshes is it registering collision with? Should they be matching the regex?

[InfraredLaser]

Here is a screen shot of the detected collision.

I thought it was the base, but perhaps it could also be a different component?

[mitchellspryn]

The collision is with mesh BP_RobotArmStand_5. That does not match the regex Ground. Updating the regex to match BP_RobotArmStand_5 should stop the events from being registered.

[InfraredLaser]

Thanks, now it works perfectly.

[InfraredLaser]

When the "Player Start" object is rotated 180 degrees I noticed this issue persisting with the UrdfBot mesh.

Here is an image of the issue:

It appears that the robot arm mesh does not like being rotated in order for the collisions to be blacklisted. Is there a way to add multiple objects to be blacklisted by regex?

[mitchellspryn]

CollisionBlacklist is a list of objects, so you should be able to just add another one if you want to exclude more meshes from collision.

[InfraredLaser]

Thanks for the reply @mitchellspryn,

What would be the best way to do so? Here is a blacklist that I have so far:

"CollisionBlacklist": [
        {
          "BotMesh": "base",
          "ExternalActorRegex": "BP_RobotArmStand_5, UrdfBot"
        }
      ],

This does not seem to work when blocking the UrdfBot mesh.

[mitchellspryn]

BP_RobotArmStand_5, UrdfBot is probably not the regex you want.

You probably want something like

{
  "BotMesh": "base", 
  "ExternalActorRegex": "BP_RobotArmStand_5"
},
{
  "BotMesh": "base",
  "ExternalActorRegex": "ObjID 0"
}

BTW, you should probably give that mesh you're colliding with a more descriptive name; it will make it easier to pick out.

[InfraredLaser]

I tried the above blacklist settings and it seems that UrdfSim still registers the collision when the robot arm closes. I also tried the below settings with the same conclusion.

{
  "BotMesh": "base",
  "ExternalActorRegex": "UrdfBot"
}