Physics Help¶

• Physics Help
• Introduction
• Child Element
• Attributes
• Enabled
• Weight
• Movable
• Bounding
• Centre
• Example
• Further reading
• Comments

Introduction¶

The IMML Physics element controls whether the element can be affected by physics in-world. An element that could logically be affected by physics (e.g a primitive, model or widget) can have physical effects applied to them, such as Impulse and Explosions.

Child Element¶

The Physics element can have these elements nested within

• Interaction

Attributes¶

Enabled¶

Type	imml:Boolean
Use	optional
Documentation	When true, requires the parent element to be included in the physics engine operations

Weight¶

Type	xs:float
Use	optional
Documentation	Weight of the element in kilograms

Movable¶

Type	imml:Boolean
Use	optional
Default	True
Documentation	When true, the physics engine should allow the body that represents this element to move

Bounding¶

Type	imml:BoundingType
Use	optional
Default	ConvexHull
Documentation	The style of physics bounding to use. Performance and interaction requirements should be taken into account when selecting a bounding type. By default, the BoundingType will wrap as closely as possible to the element's bounds.

Centre¶

Type	imml:Vector3
Use	optional
Documentation	The centre of mass the element should have.

Example¶

Here is an example of a Physics element in IMML

1 <Primitive Type="Box" Size="100,1,100" Name="Ground">
2    <Physics Enabled="True" Movable="False" />
3 </Primitive>

There is an example of an extensive implementation of a the physics element in Gravity example IMML.

Further reading¶

• Physics demo
• Adding physics and avatars
• Brilliant article on physics engines: http://www.wildbunny.co.uk/blog/2011/04/06/physics-engines-for-dummies/