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Dynamics limitations |
Particle system can have inconsistent results between disk cache and non disk cache when using rand() in expression
Workaround
Seed the random number. For example, if(frame < 2) seed(1).
Rigid bodies have a different playback result after saving the scene
The cycle involved with the rigid solver causes a different evaluation order. This problem has to do with to the DG evaluation order in a cycle.
Workaround
Before you save the scene that contains rigid bodies, do the following:
- Select Solvers > Memory Caching > Delete.
- Select Solvers > Memory Caching > Disable.
Interactive Playback limitations
Interactive Playback does not currently work with passive rigid bodies. For example, if a passive rigid body is moved while the solver is playing, active rigid bodies will only collide with the passive rigid body in its original position.
Surface emission from a trimmed surface won’t reflect new holes
With surface emission from a trimmed surface, if you add more trims or untrim the surface, the emission won't reflect the new holes.
Workaround
Bring up the geoConnector node associated with the emitter, and change the tessellation value a little, for instance, from 200 to 201. This forces re-tessellation, and the re-tessellation picks up the new trims correctly.
Rigid body keyframed passive to active resets incorrectly
Rigid body keyframed passive to active resets incorrectly if you don't freeze transform.
Workaround
Model your object first, select Modify > Freeze Transformations, then set active/passive keys, adding any fields as the last step.
Flow effects and curve flow don't work if units not in cm
Workaround
Set the scene units to cm, create a new scene, then reopen original scene.
File referencing not supported for particle expressions
Workaround
Put your particle expressions in the main file.
Fields and emitters don't convert particle positions
Fields and emitters don't convert particle positions for non-standard units
Workaround
Use standard units.
Particles may collide on creation
Particles may collide on creation when surface emitter is also a collision object.
Workaround
Reverse the normal speed parameter of the surface emission.
Rotate pivot and instancing
Instancing does not handle situations where the rotate pivot is not at the origin.
Workaround
See the script, createInstancerPivot.mel in the scripts/unsupported directory (under the main Maya install directory). The script contains directions for use.
Hardware rendering with motion blur limitation
Hardware rendering with motion blur works only if the multipass value is set at least as high as the motion blur value.
Identical rigid bodies may not collide
Two identical rigid bodies on top of one another may not collide.
Workaround
Scale, rotate, or translate one of the rigid bodies slightly.
Rigid bodies do not recognize non-planar polygons
Workaround
Triangulate the non-planar polygons.
Copying a rigid body/rigid constraint systems
When copying a rigid body/rigid constraint system, the copied constraint does not connect to the copied rigid body.
Workaround
Turn on Duplicate Input Graph in the Edit > Duplicate options window.
Ghosting is not reliable on simulated objects such as particle simulations, soft bodies, and rigid bodies
Ghosting is not reliable on simulated objects such as particle simulations, soft bodies, rigid bodies, classic cloth and jiggle deformers.
Workaround
Creating a disk cache for the simulation will typically allow ghosting to work on the object.
Particles may not evaluate properly when using emit command to emit particles
This problematic behavior may be the result of the expression not being executed or Maya may be getting the incorrect amount of particles during batch mode or prompt mode.
Workaround
Invoke getAttr on the count attribute in the order where the events are expected to happen. The getAttr can be called from within a MEL script or a regular expression as long as it happens once every frame.
Error messages appear if you modify soft body polygon topology
Modifying a polygon object's topology (by editing its upstream construction history) after making it a soft body will result in error messages.
Workaround
Adjust the construction history as desired before creating the soft body, or delete and recreate the soft body after such changes.