The reference node positions and the positions used for computing stiffness eigenvectors were previously stored in world frame. However, the runtime expects these quantities in the unrotated local frame. This caused non-zero constraint residuals and simulation instability when the grid was rotated — either by the parent body's initial orientation, or by the flexcomp's own frame attributes.
Rather than tracking each rotation source individually, this change extracts the total grid rotation directly from the cell geometry. All node positions are then un-rotated before computing the stiffness matrix.
PiperOrigin-RevId: 903232388
Change-Id: If877af89025ce1e61a76b38c29403d593d892749
Previously specs that were attached to some parent spec would resolve its asset paths relative to the modelfiledir of the parent spec. This means path resolution would change depending on the source of the parent spec. Instead, this change makes asset file path resolution relative to the "owning spec" i.e. the spec where the asset was created.
This enables workflows such as loading a parent spec via resource provider, then loading a child spec via `from_zip` or in memory providing `spec.assets` and resolution will work as intended.
PiperOrigin-RevId: 903207910
Change-Id: Ia58020ab372a3ceadf31e804d145e2ae53d8e5f9
The previous implementation only checked whether grid cells contained mesh vertices to determine occupancy. For coarse meshes with large faces, most cells were incorrectly marked empty and pruned—even cells fully inside the object volume. This change improves the algorithm by:
- Marking cells that overlap with any mesh element's AABB as non-empty.
- For surface meshes, running a flood-fill from the grid boundary through non-overlapping cells to identify truly exterior cells. This preserves empty interior cells, preventing incorrect pruning of the object's core.
- For volumetric meshes, defaulting to element-AABB overlap detection directly.
Limitations for non-watertight meshes: If the mesh contains holes larger than the grid cell size, the flood-fill will leak into the interior. In this case, all non-element cells (including interior ones) will be marked as empty.
PiperOrigin-RevId: 902675331
Change-Id: I5a84303a33d5ca7436213e7ce9aca3806c9f5a0f
Also allow multiple Meshes to be assigned at once rather than one at a
time.
This simplifies both the usage and implementation of Renderable.
PiperOrigin-RevId: 902665683
Change-Id: I23ff365a54fd6a3814ed3452b1e094ae9f698a1b
Add clamping to slider values in both ImGui widgets and mjUI to ensure they remain within the defined min/max ranges, preventing potential floating point inaccuracies from causing values to slightly exceed the bounds.
PiperOrigin-RevId: 902660458
Change-Id: Ia153ae7907f07b890f2b5ac2e3a4be93ecae7bd3
This overload allows `StringToVector` to accept a `char*` argument when parsing into a `std::vector<std::string>`, by converting the `char*` to `std::string` before processing.
PiperOrigin-RevId: 902611443
Change-Id: I2048918f915c1bac74522f368ea28f23ca9a6885
This change introduces an optimization for flexcomp objects defined by a mesh. It identifies grid cells that do not contain any mesh vertices and marks them as empty. Nodes that are exclusively part of empty cells are pinned, preventing them from moving. Stiffness computations are skipped for empty cells, reducing computational cost. The total mass is now distributed only among the non-pinned nodes.
PiperOrigin-RevId: 902565735
Change-Id: Id0a9a685536d5e18a3e42124a25ab08ff3a918f2
This CL addresses link failures when building MuJoCo with GCC and Link Time Optimization (LTO) enabled:
- Declared the `StringToVector<std::string>(const std::string&)` specialization in `user_util.h` to prevent the compiler from incorrectly trying to instantiate the general template.
- Added an explicit instantiation for `StringToVector<unsigned char>(char*)` in `user_util.cc` to provide the definition needed by its `const std::string&` counterpart.
PiperOrigin-RevId: 902557141
Change-Id: I27b585cf1deb276d4150a5cbe6cf7e59c323a20a
Combine sparse vectors in-place by first counting total `nnz` and then working backwards from the end. This removes the need for temporary buffers in `mju_combineSparse` and its callers and speeds up the function by ~10%.
PiperOrigin-RevId: 902530210
Change-Id: I4f48c327103552ab968d3915399c6067367bec9f
This provides a reduction from 26 to 18 constraints for trilinear and from 162 to 75 for quadratic. The assembly of the constraints becomes trivial. In total the speedup for a trilinear 3x3x3 grid is about 3x.
PiperOrigin-RevId: 902502398
Change-Id: I764772c7adef78da5a644f64701f842d36e4b543
Collect all entries from the recursive directory iterator, sort them, and then check for the filename. This ensures that if multiple files with the same name exist in different subdirectories, the one found is always the same, regardless of the filesystem's directory iteration order.
PiperOrigin-RevId: 902487291
Change-Id: Ia4c45cd2e3cab4a4e3825c267fc47c3134f99f76
Simplifies Renderable as it no longer has the option of owning
any Meshes. Instead, the ModelObjects owns the Meshes for
flex and skin geom (just like it owns all the other mjModel
Meshes).
PiperOrigin-RevId: 902485912
Change-Id: I8b9f9d394de6c46f7e25aa4b3885a374aad05294
Each mjEQ_FLEXSTRAIN equality now represents a single cell within a flex. This allows for more efficient sparse Jacobian computation by only considering the degrees of freedom of the nodes within each specific cell. This change gives a speedup of about 10x on a 3x3x3 model.
PiperOrigin-RevId: 902164069
Change-Id: I78eedf1d5cf39b8989fe9863c22d164922fc0efb
The flex interpolation stiffness matrix within the implicit/implicitfast solvers is now built and factorized in a banded format instead of a dense one. This involves:
- Calculating the bandwidth based on the sparsity of the mass/damping matrix and the connectivity within flex cells.
- Allocating and populating a banded matrix `H`.
- Using `mju_cholFactorBand` and `mju_cholSolveBand` for factorization and solving.
This change improves performance for flexes with many DOFs but local coupling.
PiperOrigin-RevId: 901297952
Change-Id: I3efe06353d1903ea65ab30dc49685cede228bb68
This change introduces a `flex_cellcount` field to `mjModel` to specify the number of cells in each dimension for interpolated flexes. The stiffness computation, passive force calculation, and Jacobian derivatives are updated to operate on a per-cell basis, significantly improving performance by localizing computations to the nodes within each cell.
PiperOrigin-RevId: 901216393
Change-Id: Ic23132e609de11e71bb7fef8d1f139daad2ec264
Allows the Renderable to update its own MaterialInstances whenever
Material textures or parameters are modified. Each Renderable now
also knows how it is intended to be used (i.e. scene objects or ux)
which allows it to correctly pick the underlying filament::Material
to use.
PiperOrigin-RevId: 901161990
Change-Id: Ic280731d39c272c50d6ad100cec7116e683cbc79
* Ensure compiler.usethread=0 is set before compilation in single-threaded WASM builds
* Explicitly enable exceptions for the single-threaded WASM module
* Test the single-threaded module in addition to the multi-threaded module in internal and external CI
* Consolidate wasm/tests/CMakeLists.txt into wasm/CMakeLists.txt, fixing the single-threaded benchmark test build which was missing shared linker flags
PiperOrigin-RevId: 901149728
Change-Id: If4946e29e5116610782d218906cf3f5940c1cdd0
ObjectManger now manages low-level filament Texture and
Material objects directly. Moves the IBL Texture to the
SceneBridge class.
PiperOrigin-RevId: 900626110
Change-Id: Idd39464bfb324188dd54975a500954d4ebb29006
This change introduces `nflexstiffness` and `flex_stiffnessadr` to allow flex stiffness matrices to have sizes other than the fixed 21 per element. Higher-order flexes can now store larger stiffness matrices based on their number of nodes. The `flex_stiffnessadr` array provides the starting index for each flex's stiffness data within the `flex_stiffness` array.
PiperOrigin-RevId: 899632263
Change-Id: Ie49182c46c3777acf0c6b492345edfcf62fb5e44
Use an unlit material for decorative elements and do not render them
in the reflection pass.
PiperOrigin-RevId: 899560291
Change-Id: I3b035d556432c850ce8240e0c4c4c2d6645d7bf2
Instead, use a set of functions to create/update a Renderable
from an mjvGeom.
This completely isolates mjvScene/mjvGeom from SceneView,
making SceneView a more general purpose class.
PiperOrigin-RevId: 899475268
Change-Id: I48a3a45bc8fff3e1f514847c7a1ca8ab3a1ff16e
*** Original change description ***
Add protocols for authoring simulation environments. This is for preview only, we discourage users from using this in production code.
PiperOrigin-RevId: 899425542
Change-Id: Ifb6c5d3b762789d821bfa9826f5d6d983e8af7d3
This is an early upload of https://github.com/google/filament/pull/9867 and necessary material changes
Original PR commits:
FL0 materials are always compile via spirv-cross
postfx materials now support sRGB emulation in FL0
PiperOrigin-RevId: 899262890
Change-Id: I52c002d60790d84269674c1f0d0c5f7d6a58000c
Sam Haves