Version 1.4 hotfix 1¶
- Fixed a bug where Maya Fields did not evaluate correctly if the solver transform changed after the first frame.
- When zSolver.maxNewtonIterations is greater than 1, the dynamics were often under-damped. The dynamics are correctly damped now, which will result in some simulations appearing more damped than before. To recover similar results to previous versions, decrease zSolver.stiffnessDamping and zSolver.massDamping – possibly to the new default values: 0.001 and 0.0 respectively. This was fixed in 1.4’s initial release, but missed in the release notes.
- Fixed a bug where a “Solver has encountered instabilities” message persisted even after rewinding to the first frame.
- Fixed a bug where adding a new body to the scene could affect the simulation results of existing, unconnected bodies.
- Fixed a bug where zBuilder would sometimes not record the field and zFieldAdaptor nodes.
- Fixed a bug where zBuilder would sometimes re-order zMaterial nodes.
- Add Rest Scale to make tissues shrink (or grow) equally in all directions (previously already available for cloth).
- Add Muscle Growth to grow or shrink tissues perpendicularly to muscle fibers, making characters more muscular or leaner.
- Add Pressure to apply an external pressure force to tissues (previously already available for cloth).
- Add Surface Tension to apply a surface tension force to tissues and cloth.
- Maya Fields can now be used to add external forces to Ziva bodies.
- Decreased the default value of zSolver.stiffnessDamping. This makes simulations more lively by default, but sometimes also less stable.
- In Ziva VFX v1.1 to v1.3, the attributes zMaterial.pressure and zMaterial.restScale applied only to cloth bodies, but now they also apply to tissue bodies. In existing scenes made with v1.1 to v1.3, these attributes already exist on tissue material nodes, but will not show up in the channel box. Correct this with the following MEL script:
select `ls -type zMaterial` setAttr .restScale -channelBox true setAttr .pressure -channelBox true
|Add zFieldAdaptor||Adaptor node for connecting Maya fields to Tissue and Cloth objects (to add external forces)|
|zTissue||Add iFields||To allow connection to Maya fields (via zFieldAdaptor)|
|zTissue||Add pressureEnvelope||Envelope for pressure force|
|zTissue||Add restScaleEnvelope||Envelope for rest scale|
|zTissue||Add surfaceTensionEnvelope||Envelope for surface tension|
|zCloth||Add iFields||To allow connection to Maya fields (via zFieldAdaptor)|
|zCloth||Add pressureEnvelope||Envelope for pressure force (e.g., for stable runups)|
|zCloth||Add restScaleEnvelope||Envelope for rest scale (e.g., for stable runups)|
|zCloth||Add surfaceTensionEnvelope||Envelope for surface tension (e.g., for stable runups)|
|zMaterial||Add surfaceTension||To set the amount of surface tension|
|zFiber||Add enableMuscleGrowth||Turn muscle growth on/off|
|zFiber||Add muscleGrowthScale||Amount of muscle growth|
|zFiber||Add useLoaForMuscleGrowth||Drive muscle growth via line of action|
|Add ziva -cf||To connect an existing Maya field to a Tissue/Cloth object (for external forces)|
- Improved multi-solver workflows:
- All commands can now accept scene object inputs by name. If no scene objects are given by name, the currently selected objects are used, as before.
ziva -t pSphere1;converts pSphere1 into a tissue.
zFindSelfIntersections myMesh1;finds self-intersections in myMesh1.
zCache -l "myCache.zCache" zSolver1;loads a simulation cache into zSolver1.
zSelectVerticesByProximity -r 0.5 myMesh1 myMesh2;finds vertices on myMesh1 that are within 0.5 units of myMesh2.
- Fibers and attachments draw grey when their envelope attributes are set to zero, to show that they are effectively disabled.
- Attachment rendering fades to transparent as its weightmap fades to black.
- zSelectVerticesByProximity has been renamed to zFindVerticesByProximity.
- zFindIntersections and zFindSelfIntersections can both work with any number of meshes, instead of just 2 or 1 respectively.
- zFindIntersections can optionally also find self-intersections.
- The zFindIntersections, zFindSelfIntersections, and zFindVerticesByProximity MEL commands now return selection strings instead of changing the current selection.
- The behavior of the corresponding Ziva Tools menu items has not changed, and will still set the current selection.
- To achieve the old behavior when writing MEL, you can call, for example:
- Reduce default collision stiffness on zTissue and zCloth nodes to reduce jitter and improve stability with default settings.
- The zCopyMesh command has been deprecated, and will be removed in a future release.
- Attribute zFiber.envelope also affects excitation due to zLineOfAction. Consequently, if zFiber.envelope is zero, that fiber will not contract.
- Tissue tetrahedralization will no longer happen while zSolver is disabled. Pulling on zTet.oMesh while the solver is disabled will no longer work.
- Make initial fiber endpoints work on meshes with multiple connected components. Previously, the fiber would be created and instantly cause an error in the scene.
- Fixed bug that sometimes causes fibers to draw in grey when multiple fibers are selected.
- Fixed bug that sometimes left the effect of a zFiber node even after the node was deleted.
- Minor fixes to the undo/redo behavior of ziva, zPaintAttachmentsByProximity, and zMeshCheck MEL commands.
- Add Maya 2018 support.
- Improve performance on scenes with cloth – twice as fast on some simple benchmarks.
- Improve performance in general.
- Modify mesh quality requirements for “ziva -tissue” and “ziva -cloth” commands. They are more permissive about triangle quality than before, but more picky about manifoldness. The goal is to work with more meshes out-of-the-box while still rejecting meshes that are sure to cause problems.
- Add zMeshCheck command, which can be run without a license.
- Add “rest-scale” to make cloth shrink like shrinkwrap (or grow).
- Add “pressure” to apply an external pressure force to cloth. Pressure and rest-scale are useful for wrapping fascia around muscles.
- Significant performance improvements to tetrahedralization. Previously, we have advised setting zTet.tetSize to a large value and using surface refinement and refinement propagation to get high resolution where you need it. That workaround is no longer necessary and will be slower than setting tet-size directly to what you want. Surface refinement should only be used if you actually want spatially-varying refinement.
- Lazy license checkout. The plugin only acquires a license once a node or command is run, not when the plugin is loaded.
- Mesh analysis checks for negative-volume (inverted normals), which will usually look fine, but completely breaks material attributes, particularly on subtissues.
- Significant performance improvements to zFindIntersections command (menu item “Ziva Tools” -> “Find Intersections”).
- The plugin won’t load in “maya -prompt” mode.
- Random crashes due to invalid internal constraints on cloth.
- Warnings about MEL variable-shadowing happen on plugin load.
- Running mayapy is using an authoring license instead of a batch license.
- A sliding attachment with a subtissue target crashes maya.
- Unstable cloth when rest shape was folded over itself.
- Save and Load zCache dialogs no longer filter for file type when set to “All Files”
|zMaterial||Add restScale and pressure||To support fascia simulation and more general cloth sims. In actual fact, restScale was present in 1.0, but it was undocumented and unsupported.|
|zCloth||Add restScaleEnvelope and pressureEnvelope||To support stable runup with restScale and pressure effects.|
Version 1.0 hotfix 2¶
- Fix crashes or incorrect behaviour when tissue tets are larger than 1 meter across.
- Fix incorrect spurious attachment of cloth vertices to other nearby parts of the same cloth.
- Add zLineOfAction to enable semi-automatic muscle fiber excitation.
- SubTissues - for volumetric material authoring.
- Add zPolyCombine - a fast poly combine node. We use this internally because the Maya polyCombine is much too slow.
- Empty Cavities mode on zTet mesh allows users to create internal cavities in tet mesh. For example, when meshing a fat layer over the entire body, this mode will not fill the rest of the body cavity with material.
- Increased accuracy of tissue mass and stiffness for tets partially outside the tissue surface. Depending on resolution, this can reduce object mass and jiggle relative to previous versions.
- Cloth - our cloth material model is no longer experimental. It is significantly more stable than past releases. It’s not a general cloth solution yet, but it is good for simulating fascia and skin.
- Muscle Excitation is now visualized with a fiber color change.
- Automatic fiber endpoint selection when adding a fiber node. Manual painting is still recommended, but it will paint a default automatically.
- Logging improvements. All logging has controllable verbosity. All logging goes to the script editor and a log file.
- Lots of performance improvements, affecting:
- Simulation caching
- Collision detection and response
- Attachment updates
- Attachment creation
- Material interpolation
- Fix memory leak affecting cloth, volume conservation, inertial damping, and hard attachments/contacts.
- Fix out-of-bounds memory access during tetrahedralization.
- Ziva Menus no longer attempting to load in Batch mode.
- zBones no longer draw when disabled.
- Fix random crash on Linux.
|Add zLineOfAction||Automatic muscle fiber excitation|
|Add zPolyCombine||Fast alternative to Maya’s polyCombine|
|zTissue||Add iParentTissue and oChildTissue||To support subtissues.|
|zTissue||Add serializedCache||To support fast re-opening of scenes. Internal use only.|
|zTet||Change fillInterior from bool to enum.||To support a new option ‘Empty Cavities’. See Tetrahedal Meshes|
|zTet||Remove tetsUpperBound. Add maxResolution.||Same purpose, but the new parameter is easier to explain and understand.|
|zEmbedder||Remove iSolverParams||No longer needed.|
|zCloth||Remove collisionVolume||This never worked anyway.|
|zIsoMesh||Add inputGeometry||To allow a faster and more accurate algorithm on watertight input meshes.|
|Add ziva -addSubtissue||To support subtissues|
|Add ziva -removeSubtissue||To support subtissues|
|Add ziva -lineOfAction||To enable automatic muscle excitation.|
|Add zLineOfActionUtil||To help make rigs for automatic muscle excitation.|
|Add zPolyCombine||To create the new zPolyCombine node.|