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Allow to create concave collision meshes. Note that this is only supported for static (mass 0) multibodies.

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This commit is contained in:
Erwin Coumans
2017-06-23 14:43:28 -07:00
parent a136098120
commit 2ab56b4d62
5 changed files with 111 additions and 40 deletions
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128
examples/SharedMemory/PhysicsServerCommandProcessor.cpp
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@@ -14,7 +14,7 @@
#include "../Importers/ImportURDFDemo/UrdfParser.h"
#include "../Utils/b3ResourcePath.h"
#include "Bullet3Common/b3FileUtils.h"
#include "../OpenGLWindow/GLInstanceGraphicsShape.h"
#include "BulletDynamics/Featherstone/btMultiBodySliderConstraint.h"
#include "BulletDynamics/Featherstone/btMultiBodyPoint2Point.h"
#include "BulletCollision/NarrowPhaseCollision/btPersistentManifold.h"
@@ -3704,50 +3704,102 @@ bool PhysicsServerCommandProcessor::processCommand(const struct SharedMemoryComm
{
if (out_type==UrdfGeometry::FILE_OBJ)
{
std::vector<tinyobj::shape_t> shapes;
std::string err = tinyobj::LoadObj(shapes,out_found_filename.c_str());
//create a convex hull for each shape, and store it in a btCompoundShape
//shape = createConvexHullFromShapes(shapes, collision->m_geometry.m_meshScale);
//static btCollisionShape* createConvexHullFromShapes(std::vector<tinyobj::shape_t>& shapes, const btVector3& geomScale)
B3_PROFILE("createConvexHullFromShapes");
if (compound==0)
if (clientCmd.m_createCollisionShapeArgs.m_shapes[i].m_collisionFlags&GEOM_FORCE_CONCAVE_TRIMESH)
{
compound = worldImporter->createCompoundShape();
}
compound->setMargin(defaultCollisionMargin);
for (int s = 0; s<(int)shapes.size(); s++)
{
btConvexHullShape* convexHull = worldImporter->createConvexHullShape();
convexHull->setMargin(defaultCollisionMargin);
tinyobj::shape_t& shape = shapes[s];
int faceCount = shape.mesh.indices.size();
for (int f = 0; f<faceCount; f += 3)
GLInstanceGraphicsShape* glmesh = LoadMeshFromObj(relativeFileName, pathPrefix);
if (!glmesh || glmesh->m_numvertices<=0)
{
b3Warning("%s: cannot extract mesh from '%s'\n", pathPrefix, relativeFileName);
delete glmesh;
break;
}
btAlignedObjectArray<btVector3> convertedVerts;
convertedVerts.reserve(glmesh->m_numvertices);
btVector3 meshScale(clientCmd.m_createCollisionShapeArgs.m_shapes[i].m_meshScale[0],
clientCmd.m_createCollisionShapeArgs.m_shapes[i].m_meshScale[1],
clientCmd.m_createCollisionShapeArgs.m_shapes[i].m_meshScale[2]);
btVector3 pt;
pt.setValue(shape.mesh.positions[shape.mesh.indices[f] * 3 + 0],
shape.mesh.positions[shape.mesh.indices[f] * 3 + 1],
shape.mesh.positions[shape.mesh.indices[f] * 3 + 2]);
convexHull->addPoint(pt*meshScale,false);
pt.setValue(shape.mesh.positions[shape.mesh.indices[f + 1] * 3 + 0],
shape.mesh.positions[shape.mesh.indices[f + 1] * 3 + 1],
shape.mesh.positions[shape.mesh.indices[f + 1] * 3 + 2]);
convexHull->addPoint(pt*meshScale, false);
pt.setValue(shape.mesh.positions[shape.mesh.indices[f + 2] * 3 + 0],
shape.mesh.positions[shape.mesh.indices[f + 2] * 3 + 1],
shape.mesh.positions[shape.mesh.indices[f + 2] * 3 + 2]);
convexHull->addPoint(pt*meshScale, false);
for (int i=0; i<glmesh->m_numvertices; i++)
{
convertedVerts.push_back(btVector3(
glmesh->m_vertices->at(i).xyzw[0]*meshScale[0],
glmesh->m_vertices->at(i).xyzw[1]*meshScale[1],
glmesh->m_vertices->at(i).xyzw[2]*meshScale[2]));
}
convexHull->recalcLocalAabb();
convexHull->optimizeConvexHull();
compound->addChildShape(childTransform,convexHull);
BT_PROFILE("convert trimesh");
btTriangleMesh* meshInterface = new btTriangleMesh();
{
BT_PROFILE("convert vertices");
for (int i=0; i<glmesh->m_numIndices/3; i++)
{
const btVector3& v0 = convertedVerts[glmesh->m_indices->at(i*3)];
const btVector3& v1 = convertedVerts[glmesh->m_indices->at(i*3+1)];
const btVector3& v2 = convertedVerts[glmesh->m_indices->at(i*3+2)];
meshInterface->addTriangle(v0,v1,v2);
}
}
{
BT_PROFILE("create btBvhTriangleMeshShape");
btBvhTriangleMeshShape* trimesh = new btBvhTriangleMeshShape(meshInterface,true,true);
//trimesh->setLocalScaling(collision->m_geometry.m_meshScale);
shape = trimesh;
if (compound)
{
compound->addChildShape(childTransform,shape);
}
}
} else
{
std::vector<tinyobj::shape_t> shapes;
std::string err = tinyobj::LoadObj(shapes,out_found_filename.c_str());
//shape = createConvexHullFromShapes(shapes, collision->m_geometry.m_meshScale);
//static btCollisionShape* createConvexHullFromShapes(std::vector<tinyobj::shape_t>& shapes, const btVector3& geomScale)
B3_PROFILE("createConvexHullFromShapes");
if (compound==0)
{
compound = worldImporter->createCompoundShape();
}
compound->setMargin(defaultCollisionMargin);
for (int s = 0; s<(int)shapes.size(); s++)
{
btConvexHullShape* convexHull = worldImporter->createConvexHullShape();
convexHull->setMargin(defaultCollisionMargin);
tinyobj::shape_t& shape = shapes[s];
int faceCount = shape.mesh.indices.size();
for (int f = 0; f<faceCount; f += 3)
{
btVector3 pt;
pt.setValue(shape.mesh.positions[shape.mesh.indices[f] * 3 + 0],
shape.mesh.positions[shape.mesh.indices[f] * 3 + 1],
shape.mesh.positions[shape.mesh.indices[f] * 3 + 2]);
convexHull->addPoint(pt*meshScale,false);
pt.setValue(shape.mesh.positions[shape.mesh.indices[f + 1] * 3 + 0],
shape.mesh.positions[shape.mesh.indices[f + 1] * 3 + 1],
shape.mesh.positions[shape.mesh.indices[f + 1] * 3 + 2]);
convexHull->addPoint(pt*meshScale, false);
pt.setValue(shape.mesh.positions[shape.mesh.indices[f + 2] * 3 + 0],
shape.mesh.positions[shape.mesh.indices[f + 2] * 3 + 1],
shape.mesh.positions[shape.mesh.indices[f + 2] * 3 + 2]);
convexHull->addPoint(pt*meshScale, false);
}
convexHull->recalcLocalAabb();
convexHull->optimizeConvexHull();
compound->addChildShape(childTransform,convexHull);
}
}
}
}