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Add vertex-based flex constraints (dim=2).

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PiperOrigin-RevId: 859552050
Change-Id: I61d4b9dc40f041c5b930e5f8810a803e8bccb87a
This commit is contained in:
Alessio Quaglino
2026-01-22 04:54:11 -08:00
committed by Copybara-Service
parent 2cc2e579f1
commit 54dd623650
15 changed files with 705 additions and 22 deletions
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include/mujoco/mjmodel.h
+6 -1
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@@ -702,6 +702,7 @@ struct mjModel_ {
int nflexevpair; // number of element-vertex pairs in all flexes
int nflextexcoord; // number of vertices with texture coordinates
int nJfe; // number of non-zeros in sparse flexedge Jacobian matrix
int nJfv; // number of non-zeros in sparse flexvert Jacobian matrix
int nmesh; // number of meshes
int nmeshvert; // number of vertices in all meshes
int nmeshnormal; // number of normals in all meshes
@@ -996,12 +997,13 @@ struct mjModel_ {
mjtNum* flexedge_length0; // edge lengths in qpos0 (nflexedge x 1)
mjtNum* flexedge_invweight0; // edge inv. weight in qpos0 (nflexedge x 1)
mjtNum* flex_radius; // radius around primitive element (nflex x 1)
mjtNum* flex_size; // vertex bounding box half sizes in qpos0 (nflex x 3)
mjtNum* flex_stiffness; // finite element stiffness matrix (nflexelem x 21)
mjtNum* flex_bending; // bending stiffness (nflexedge x 17)
mjtNum* flex_damping; // Rayleigh's damping coefficient (nflex x 1)
mjtNum* flex_edgestiffness; // edge stiffness (nflex x 1)
mjtNum* flex_edgedamping; // edge damping (nflex x 1)
mjtByte* flex_edgeequality; // is edge equality constraint defined (nflex x 1)
int* flex_edgeequality; // 0: none, 1: edges, 2: vertices (nflex x 1)
mjtByte* flex_rigid; // are all vertices in the same body (nflex x 1)
mjtByte* flexedge_rigid; // are both edge vertices in same body (nflexedge x 1)
mjtByte* flex_centered; // are all vertex coordinates (0,0,0) (nflex x 1)
@@ -1011,6 +1013,9 @@ struct mjModel_ {
int* flexedge_J_rownnz; // number of non-zeros in Jacobian row (nflexedge x 1)
int* flexedge_J_rowadr; // row start address in colind array (nflexedge x 1)
int* flexedge_J_colind; // column indices in sparse Jacobian (nJfe x 1)
int* flexvert_J_rownnz; // number of non-zeros in Jacobian row (nflexvert x 2)
int* flexvert_J_rowadr; // row start address in colind array (nflexvert x 2)
int* flexvert_J_colind; // column indices in sparse Jacobian (nJfv x 2)
float* flex_rgba; // rgba when material is omitted (nflex x 4)
float* flex_texcoord; // vertex texture coordinates (nflextexcoord x 2)