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wiki>Brita: moved Dev:Source/GameEngine/BulletSoftBody to Dev:Source/GameEngine/2.49/BulletSoftBody

2014-08-07T13:59:37Z

moved Dev:Source/GameEngine/BulletSoftBody to Dev:Source/GameEngine/2.49/BulletSoftBody

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= Bullet Soft Bodies in the Blender Game Engine =

== Overview==
From Blender 2.48 onwards, the game engine features Bullet soft body simulation. Here is some information about features and how to use them.
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== Soft Body Features ==
* Flat cloth or volumetric soft bodies
* Control over mass, friction, stiffness, shape matching and collision detection settings
* Collision detection beween soft bodies as well as rigid bodies and static collision bounds of all types.
* Attaching soft bodies against rigid bodies or using fixed pinning
* Physics Debug Visualization of the dynamic soft body structures
* Dynamically create new soft bodies using the Add Object Actuator

== Sample files and feedback ==
*Download some [http://www.bulletphysics.com/ftp/pub/test/index.php?dir=blender/&file=blender-2.48-gamesoftbody-sample-blends-10.zip example .blend files] for soft bodies (1.5Mb)
*Download the [http://bulletphysics.com/ftp/pub/test/index.php?dir=blender/&file=bathroom_final_1.2.zip bathroom .blend file], (14Mb)
*You can discuss/provide feedback at this [http://blenderartists.org/forum/showthread.php?t=135471 BlenderArtists topic].
*More information about Bullet soft body simulation at http://bulletphysics.com

== Creating a Bullet soft body ==
*Game Buttons: choose between static, dynamic, rigid body or soft body
[[Image:softbody_select_new_small.jpg|right]]
*Choosing collision shape bounds for soft bodies
*The bounds type for soft bodies are automatically restricted to convex hull or triangle mesh bounds.
=== Basic Soft Body Setting ===
*Linear Stiffness: lower values create very flexible soft bodies, and larger value (1) more stiff. Note that the shape matching feature and bending constraints will still keep extreme flexible bodies in shape.
*Shape matching: If this option is enabled, Bullet will remember the original shape of each soft body, and tries to match the shape of a soft body, no matter how large the deformation has been.
*kMT Shape mathing coefficient: how strong the soft body will return to its original shape. This only appear when the Shape Matching option is enabled.
*Friction allows to control the dynamic friction for soft bodies, in the range [0..1]. 0 means no friction, soft bodies will slide.
[[Image:softbody_new_buttons.jpg]]
=== Advanced Settings ===
*Use Clusters: collision clusters can improve the collision detection, and it can avoid soft bodies passing through triangle meshes. Instead of colliding between individual vertices/nodes and faces, deformable convex clusters can be used. You can choose to use clusters between soft bodies, or between soft body and rigid body.
*Cluster Iterations: Higher values will create more detailed collision clusters. If you choose 1 it will use a single cluster using all vertices. This setting is only used if Clusters RB / SS is enabled.
*Position Iter: position solver iterations. Use a higher value to improve the quality of position correction for soft bodies.
[[Image:softbody_advanced_new.jpg]]

== Pinning or attaching soft bodies ==
*You can use the Rigid Body Joint to attach a rigid body against a soft body. Similar to rigid body constraints, you can also pin/fix a soft body to make a vertex non-movable: just don't provide a second attachment object, or attach to a static object.
*Right now, vertex groups are not supported, so you have to use Rigid Body Joint constraints.
*Select a single soft body, or both a soft body and rigid body, using the Rigid Body Joint button:
[[Image:softbody_constraint_selection_smaller.jpg|right]]
*Enable the Show Pivot to see where the soft body will be pinned (px/py/pz frame). Bullet will automatically take the closest vertex/node to this pivot point.
*You can use multiple constraints to pin/attach multiple parts of the soft body.
*Use No Col button to disable collision detection between bodies connected by constraints. This might avoid instability and jitter between connected bodies.
[[Image:disable_collision_connected.jpg]]
*Python constraints can be used to create soft body constraints while the game is running. However, currently you cannot remove those constraints on-the-fly.

== General soft body tips and some known issues ==
*Add Object Actuator can be used to dynamically add new soft bodies.
[[Image:add_object_actuator.jpg|right]]
*Only the applyForce in the motion actuator is enabled. setPosition, constraint actuator and other logic doesn't work with soft bodies.
*Soft body option will draw objects as 'smooth', because it always updates both vertices and vertex normals.
*Subdivide the soft body triangle mesh to allow some deformation: go into edit more, select all vertices (A) and hit subdivide.
[[Image:subdivide_mesh_small.jpg]]
*UV Sphere meshes are not compatible with soft bodies, so use a Ico sphere instead.
*If the mesh is too detailed, simplify the mesh using mesh decimation:
[[Image:mesh_decimation_small.jpg]]
*Blender 2.48 performs no collisions between soft bodies that have Clusters enabled, and soft bodies that have Clusters disabled. This will be fixed in future versions.
*Use Show Physics Visualization to debug issues with soft bodies, collision shapes etc. Enable the setting in the game menu:
*When running the game with Show Physics Visualization enabled, you will notice the complex dynamic structures for soft bodies.
*Self-collision is not currently supported.
*There are no python bindings to control soft bodies, and no logic brick support, except for apply force and add object actuator.
*Soft body / cloth objects don't support the collision/near/radar sensor.
*There is currently a large gap/margin between cloth and collision objects. There is no control over this gap right now, it might improve in later/future Blender versions.
*Don't use scaled meshes. Instead, use the Apply Scaling feature, or Apply Scale and Rotation by selecting the soft body object and pressing <CTRL> A:
[[Image:apply_scaling.jpg]]

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wiki>Brita: moved Dev:Source/GameEngine/BulletSoftBody to Dev:Source/GameEngine/2.49/BulletSoftBody

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