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Simple Collision Example

by Dave DAmico · in Torque X 2D · 09/03/2008 (11:50 am) · 7 replies

Does anyone have a simple example on how to do collision. I've looked at the FPS demo but have had no luck getting the results I want. I have two objects in my scene: 1 desk and 1 camera. All I want to do is not allow the camera to move through the desk.
Here is the desk object:

<TorqueObject type="GarageGames.Torque.Core.TorqueObject" name="TrainingRoomDesk">
      <Components>
        <T3DSceneComponent type="GarageGames.Torque.T3D.T3DSceneComponent" name="roomSceneComponent">
          <UseOwnerObjectType>true</UseOwnerObjectType>
          <Visible>true</Visible>
          <VisibilityLevel>1</VisibilityLevel>
          <Position>
            <X>-15.45307</X>
            <Y>200</Y>
            <Z>373.1856</Z>
          </Position>
          <Rotation>
            <X>0.7071</X>
            <Y>0</Y>
            <Z>0</Z>
            <W>0.7071</W>
          </Rotation>
          <Scale>
            <X>1</X>
            <Y>1</Y>
            <Z>1</Z>
          </Scale>
          <Name>roomSceneComponent</Name>
        </T3DSceneComponent>
        <T3DXNARenderComponent type="GarageGames.Torque.T3D.T3DXNARenderComponent" name="compRender">
          <Filename>data/shape/TrainingRoomDesk</Filename>
          <ConvertToTorqueCoords>false</ConvertToTorqueCoords>
          <Name>compRender</Name>
        </T3DXNARenderComponent>
        <T3DRigidComponent type="GarageGames.Torque.T3D.T3DRigidComponent" name="deskRigidComponent">
          <GravityScale>9</GravityScale>
          <Mass>0</Mass>
          <Kinetic>true</Kinetic>
          <Immovable>true</Immovable>
          <Velocity>
            <X>0</X>
            <Y>0</Y>
            <Z>0</Z>
          </Velocity>
          <RotationScale>1</RotationScale>
          <ResolveCollisions>true</ResolveCollisions>
          <AnimateCollisionOffsets>false</AnimateCollisionOffsets>
          <RenderCollisionBounds>true</RenderCollisionBounds>
          <Name>deskRigidComponent</Name>
        </T3DRigidComponent>
      </Components>
      <Pool>false</Pool>
      <PoolWithComponents>false</PoolWithComponents>
      <IsTemplate>false</IsTemplate>
      <IsPersistent>false</IsPersistent>
      <Notched>false</Notched>
    </TorqueObject>

Here is the camera:
<TorqueObject type="GarageGames.Torque.Core.TorqueObject" name="Camera">
      <Components>
        <CameraComponent type="GarageGames.Torque.T3D.FreeCameraComponent" name="CameraComponent">
          <RigidManager nameRef="RigidManager" />
          <FarDistance>1000</FarDistance>
          <FOV>1.57</FOV>
        </CameraComponent>
        <T3DSceneComponent type="GarageGames.Torque.T3D.T3DSceneComponent" name="">
          <UseOwnerObjectType>true</UseOwnerObjectType>
          <Visible>true</Visible>
          <VisibilityLevel>1</VisibilityLevel>
          <Position>
            <X>48.9337</X>
            <Y>-167.0184</Y>
            <Z>485.208</Z>
          </Position>
          <Rotation>
            <X>0</X>
            <Y>0</Y>
            <Z>0</Z>
            <W>1</W>
          </Rotation>
          <Scale>
            <X>1</X>
            <Y>1</Y>
            <Z>1</Z>
          </Scale>
        </T3DSceneComponent>
      </Components>
      <Pool>false</Pool>
      <PoolWithComponents>false</PoolWithComponents>
      <IsTemplate>false</IsTemplate>
      <IsPersistent>false</IsPersistent>
      <Notched>false</Notched>
    </TorqueObject>
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Associate John Kanalakis
EnvyGames
#1
09/08/2008 (9:38 pm)
You also need a RigidManager for the scene, which the rigid component points to. I also did not see a collision shape attached to your T3DRigidComponent, such as a sphere or cube. You'll also need one attached to the TorqueObject that serves as your camera (as the other colliding entity).

John K.

Torque Owner Dave DAmico
#2
09/09/2008 (6:59 am)
Thanks, John. One other question... when defining collision shapes, is the Center property relative to the scene or the object. For instance, if I'm creating box around an object and that object is located at 100,100,100 would the center be 100,100,100 or 0,0,0?

Associate John Kanalakis
EnvyGames
#3
09/10/2008 (12:27 am)
The position is relative to the SceneGroup - so it's usually Vector3.Zero... Here's how I do it...

T3DRigidComponent componentPhysics = new T3DRigidComponent();
componentPhysics.SceneGroupName = "PlayerSceneGroup";
componentPhysics.GravityScale = 1.5f;
componentPhysics.Mass = 10f;
componentPhysics.RigidManager = rigidManager; //RigidManager for the scene
componentPhysics.CollisionBody.AddCollisionShape(new CollisionBoxShape());
objPlayer.Components.Add(componentPhysics);

In this case, I'm using a Box collision shape. I believe that the FPSDemo uses a couple of stacked spheres, like a 'snowman' to simulate a more organic collision shape. Since they are stacking the spheres, they need to set the position offset.

John K.

Torque Owner Dave DAmico
#4
12/22/2008 (11:53 am)
Another follow-up question: I need to make a room, what would be the best way to make the camera collide with the walls? Would each wall need to be a model and have a rigid component?

Torque Owner Takuan Daikon
#5
12/24/2008 (7:42 am)
You can add a CollisionMeshShape to a room model, so that the entire room has a single collision shape, or you can add any number of CollisionBoxShape shapes to the room model's RigidComponent, one for each wall. The second way will probably be more efficient and load much faster.

Torque Owner Dave DAmico
#6
12/29/2008 (8:11 am)
I see... how about the floor. lets say i didn't want a terrain since every thing is going to be contained in a hall and a few rooms with no windows. could i do the same thing?

Torque Owner Dave DAmico
#7
12/29/2008 (10:17 am)
I tested out using the bounding box on for the floor. It seems to work, however, I cannot control the player. I'm assuming because the player is not considered "on the ground". Is this a correct assumption? If so, how can I make the floor act as the ground?