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Fluid Object

Fluid object settings

All regions of this object that are inside the domain bounding box will be used as actual fluid in the simulation. If you place more than one fluid object inside the domain, they should currently not intersect. Also make sure the surface normals are pointing outwards. In contrast to domain objects, the actual mesh geometry is used for fluid objects.

Volume initialization type
  • Volume will initialize the inner part of the object as fluid. This works only for closed objects.
  • Shell will initialize only a thin layer for all faces of the mesh. This also works for non closed meshes.
  • Both combines volume and shell - the mesh should also be closed. See the picture below.
Example of the different volume init types: Volume, Shell and Both (the shell is usually slightly larger than the inner volume)

Animated Mesh/Export
Click this button if the mesh is animated (e.g. deformed by an armature, shape keys or a lattice). Note that this can be significantly slower, and is not required if the mesh is animated with position or rotation Ipos (i.e. only object transformations).
Initial velocity
Speed of the fluid at the beginning of the simulation, in meters per second.

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The direction of Surface Normals makes a big difference!
Blender uses the orientation of the Surface Normals to determine what is “inside of” the Fluid object and what is “outside”. You want all of the normals to face outside (in Edit mode, use CtrlN or press Space and choose Edit → Normals → Calculate Outside). If the normals face the wrong way, you’ll be rewarded with a “gigantic flood of water” because Blender will think that the volume of the object is outside of its mesh! This applies regardless of the Volume init type setting.