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Use the geom frame for SDF collisions.

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Also disables mesh reorientation for meshes autogenerated with marching cubes from analytic SDFs.

PiperOrigin-RevId: 781487195
Change-Id: I36b66384f240a764823c489f78f22ba9fe32f15f
This commit is contained in:
Alessio Quaglino
2025-07-10 05:14:09 -07:00
committed by Copybara-Service
parent 7e57a6bc30
commit 2d69610abd
4 changed files with 52 additions and 79 deletions
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src/engine/engine_collision_sdf.c
+13 -36
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@@ -480,24 +480,6 @@ static void mapPose(const mjtNum xpos1[3], const mjtNum xquat1[4],
mju_quat2Mat(mat12, quat12);
}
// subtract mesh position from sdf transformation
static void undoTransformation(const mjModel* m, const mjData* d, int g,
mjtNum sdf_xpos[3], mjtNum sdf_quat[4]) {
mjtNum* xpos = d->geom_xpos + 3 * g;
mjtNum* xmat = d->geom_xmat + 9 * g;
if (m->geom_type[g] == mjGEOM_MESH || m->geom_type[g] == mjGEOM_SDF) {
mjtNum negpos[3], negquat[4], xquat[4];
mjtNum* pos = m->mesh_pos + 3 * m->geom_dataid[g];
mjtNum* quat = m->mesh_quat + 4 * m->geom_dataid[g];
mju_mat2Quat(xquat, xmat);
mju_negPose(negpos, negquat, pos, quat);
mju_mulPose(sdf_xpos, sdf_quat, xpos, xquat, negpos, negquat);
} else {
mju_copy3(sdf_xpos, xpos);
mju_mat2Quat(sdf_quat, xmat);
}
}
//---------------------------- narrow phase -----------------------------------------------
// comparison function for contact sorting
@@ -767,8 +749,7 @@ int mjc_HFieldSDF(const mjModel* m, const mjData* d, mjContact* con, int g1, int
// collision between a mesh and a signed distance field
int mjc_MeshSDF(const mjModel* m, const mjData* d, mjContact* con, int g1, int g2, mjtNum margin) {
mjtNum* pos1 = d->geom_xpos + 3 * g1;
mjtNum* mat1 = d->geom_xmat + 9 * g1;
mjGETINFO;
mjtNum offset[3], rotation[9], corners[9], x[3], depth;
mjtNum points[3*MAXSDFFACE], dist[MAXMESHPNT], candidate[3*MAXMESHPNT];
@@ -790,10 +771,10 @@ int mjc_MeshSDF(const mjModel* m, const mjData* d, mjContact* con, int g1, int g
sdf.geomtype = &geomtype;
// compute transformation from g1 to g2
mjtNum pos2true[3], sdf_quat[4], quat1[4];
mjtNum sdf_quat[4], quat1[4];
mju_mat2Quat(quat1, mat1);
undoTransformation(m, d, g2, pos2true, sdf_quat);
mapPose(pos1, quat1, pos2true, sdf_quat, offset, rotation);
mju_mat2Quat(sdf_quat, mat2);
mapPose(pos1, quat1, pos2, sdf_quat, offset, rotation);
// binary tree search
collideBVH(m, (mjData*)d, g1, offset, rotation, faces, &npoints, &n0, &sdf);
@@ -845,7 +826,7 @@ int mjc_MeshSDF(const mjModel* m, const mjData* d, mjContact* con, int g1, int g
// add only the first mjMAXCONPAIR pairs
for (int i=0; i < mju_min(ncandidate, mjMAXCONPAIR); i++) {
cnt = addContact(points, con, candidate + 3*index[i], pos2true, sdf_quat,
cnt = addContact(points, con, candidate + 3*index[i], pos2, sdf_quat,
dist[index[i]], cnt, m, &sdf, (mjData*)d);
}
@@ -871,17 +852,13 @@ int mjc_SDF(const mjModel* m, const mjData* d, mjContact* con, int g1, int g2, m
// compute transformations from/to g1 to/from g2
mjtNum quat1[4], quat2[4];
mjtNum pos1true[3], offset21[3], rotation21[9], rotation12[9];
mjtNum pos2true[3], offset1[3], rotation1[9], offset12[3];
mjtNum offset2[3], rotation2[9], squat1[4], squat2[4];
undoTransformation(m, d, g1, pos1true, squat1);
undoTransformation(m, d, g2, pos2true, squat2);
mjtNum offset21[3], rotation21[9], rotation12[9];
mjtNum offset12[3], offset2[3], rotation2[9];
mju_mat2Quat(quat1, mat1);
mju_mat2Quat(quat2, mat2);
mapPose(pos2, quat2, pos1, quat1, offset1, rotation1);
mapPose(pos1, quat1, pos1true, squat1, offset2, rotation2);
mapPose(pos2true, squat2, pos1true, squat1, offset21, rotation21);
mapPose(pos1true, squat1, pos2true, squat2, offset12, rotation12);
mapPose(pos1, quat1, pos1, quat1, offset2, rotation2);
mapPose(pos2, quat2, pos1, quat1, offset21, rotation21);
mapPose(pos1, quat1, pos2, quat2, offset12, rotation12);
// axis-aligned bounding boxes in g1 frame
for (int i=0; i < 8; i++) {
@@ -893,8 +870,8 @@ int mjc_SDF(const mjModel* m, const mjData* d, mjContact* con, int g1, int g2, m
vec2[1] = (i&2 ? size2[1]+size2[4] : size2[1]-size2[4]);
vec2[2] = (i&4 ? size2[2]+size2[5] : size2[2]-size2[5]);
mju_mulMatVec3(vec2, rotation1, vec2);
mju_addTo3(vec2, offset1);
mju_mulMatVec3(vec2, rotation21, vec2);
mju_addTo3(vec2, offset21);
for (int k=0; k < 3; k++) {
aabb1[0+k] = mju_min(aabb1[0+k], vec1[k]);
@@ -983,7 +960,7 @@ int mjc_SDF(const mjModel* m, const mjData* d, mjContact* con, int g1, int g2, m
// contact point and normal - we use the midsurface where SDF1=SDF2 as zero level set
sdf.type = mjSDFTYPE_MIDSURFACE;
cnt = addContact(contacts, con, x, pos2true, squat2, dist, cnt, m, &sdf, (mjData*)d);
cnt = addContact(contacts, con, x, pos2, quat2, dist, cnt, m, &sdf, (mjData*)d);
// SHOULD NOT OCCUR
if (cnt > mjMAXCONPAIR) {