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Generate tetrahedral cylinder. Also added some assertion code.

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This commit is contained in:
Irlan 2019-05-14 13:47:04 -03:00
parent c972052f3b
commit e1b5e615e3
2 changed files with 46 additions and 0 deletions
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2
include/bounce/softbody/softbody_mesh.h
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@ -40,6 +40,8 @@ struct b3QSoftBodyMesh : public b3SoftBodyMesh
~b3QSoftBodyMesh(); ~b3QSoftBodyMesh();
void SetAsSphere(float32 radius, u32 subdivisions); void SetAsSphere(float32 radius, u32 subdivisions);
void SetAsCylinder(float32 radius, float32 ey, u32 segments);
}; };
#endif #endif

44
src/bounce/softbody/softbody_mesh.cpp
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@ -18,6 +18,7 @@
#include <bounce/softbody/softbody_mesh.h> #include <bounce/softbody/softbody_mesh.h>
#include <bounce/meshgen/sphere_mesh.h> #include <bounce/meshgen/sphere_mesh.h>
#include <bounce/meshgen/cylinder_mesh.h>
b3QSoftBodyMesh::b3QSoftBodyMesh() b3QSoftBodyMesh::b3QSoftBodyMesh()
{ {
@ -38,6 +39,7 @@ void b3QSoftBodyMesh::SetAsSphere(float32 radius, u32 subdivisions)
smMesh mesh; smMesh mesh;
smCreateMesh(mesh, subdivisions); smCreateMesh(mesh, subdivisions);
B3_ASSERT(vertexCount == 0);
vertexCount = 1 + mesh.vertexCount; vertexCount = 1 + mesh.vertexCount;
vertices = (b3Vec3*)b3Alloc(vertexCount * sizeof(b3Vec3)); vertices = (b3Vec3*)b3Alloc(vertexCount * sizeof(b3Vec3));
vertices[0].SetZero(); vertices[0].SetZero();
@ -46,6 +48,7 @@ void b3QSoftBodyMesh::SetAsSphere(float32 radius, u32 subdivisions)
vertices[1 + i] = mesh.vertices[i]; vertices[1 + i] = mesh.vertices[i];
} }
B3_ASSERT(tetrahedronCount == 0);
tetrahedronCount = mesh.indexCount / 3; tetrahedronCount = mesh.indexCount / 3;
tetrahedrons = (b3SoftBodyMeshTetrahedron*)b3Alloc(tetrahedronCount * sizeof(b3SoftBodyMeshTetrahedron)); tetrahedrons = (b3SoftBodyMeshTetrahedron*)b3Alloc(tetrahedronCount * sizeof(b3SoftBodyMeshTetrahedron));
for (u32 i = 0; i < mesh.indexCount / 3; ++i) for (u32 i = 0; i < mesh.indexCount / 3; ++i)
@ -66,4 +69,45 @@ void b3QSoftBodyMesh::SetAsSphere(float32 radius, u32 subdivisions)
{ {
vertices[i] *= radius; vertices[i] *= radius;
} }
}
void b3QSoftBodyMesh::SetAsCylinder(float32 radius, float32 ey, u32 segments)
{
cymMesh mesh;
cymCreateMesh(mesh, segments);
B3_ASSERT(vertexCount == 0);
vertexCount = 1 + mesh.vertexCount;
vertices = (b3Vec3*)b3Alloc(vertexCount * sizeof(b3Vec3));
vertices[0].SetZero();
for (u32 i = 0; i < mesh.vertexCount; ++i)
{
vertices[1 + i] = mesh.vertices[i];
}
B3_ASSERT(tetrahedronCount == 0);
tetrahedronCount = mesh.indexCount / 3;
tetrahedrons = (b3SoftBodyMeshTetrahedron*)b3Alloc(tetrahedronCount * sizeof(b3SoftBodyMeshTetrahedron));
for (u32 i = 0; i < mesh.indexCount / 3; ++i)
{
u32 v1 = mesh.indices[3 * i + 0];
u32 v2 = mesh.indices[3 * i + 1];
u32 v3 = mesh.indices[3 * i + 2];
b3SoftBodyMeshTetrahedron* t = tetrahedrons + i;
t->v1 = 1 + v3;
t->v2 = 1 + v2;
t->v3 = 1 + v1;
t->v4 = 0;
}
float32 height = 2.0f * ey;
for (u32 i = 0; i < vertexCount; ++i)
{
vertices[i].x *= radius;
vertices[i].y *= height;
vertices[i].z *= radius;
}
} }