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egg2pg: fix CollisionBox generation for transformed objects

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Rather than xforming after the fact, which does not work properly for boxes, we need to apply the transform to the vertices around which the box is generated.

Fixes #506
This commit is contained in:
rdb 2019-03-17 19:07:47 +01:00
parent e486bbcb3f
commit 4f94b3aa0e
2 changed files with 32 additions and 12 deletions
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42
panda/src/egg2pg/eggLoader.cxx
View File

@ -1814,10 +1814,11 @@ make_node(EggGroup *egg_group, PandaNode *parent) {
// A collision group: create collision geometry.
node = new CollisionNode(egg_group->get_name());
// Piggy-back the desired transform to apply onto the node, since we can't
// break the ABI in 1.10.
node->set_transform(TransformState::make_mat(LCAST(PN_stdfloat, egg_group->get_vertex_to_node())));
make_collision_solids(egg_group, egg_group, (CollisionNode *)node.p());
// Transform all of the collision solids into local space.
node->xform(LCAST(PN_stdfloat, egg_group->get_vertex_to_node()));
node->clear_transform();
if ((egg_group->get_collide_flags() & EggGroup::CF_keep) != 0) {
// If we also specified to keep the geometry, continue the traversal.
@ -2773,7 +2774,7 @@ make_sphere(EggGroup *egg_group, EggGroup::CollideFlags flags,
*/
bool EggLoader::
make_box(EggGroup *egg_group, EggGroup::CollideFlags flags,
LPoint3 &min_p, LPoint3 &max_p, LColor &color) {
const LMatrix4 &xform, LPoint3 &min_p, LPoint3 &max_p) {
EggGroup *geom_group = find_collision_geometry(egg_group, flags);
if (geom_group != nullptr) {
// Collect all of the vertices.
@ -2802,13 +2803,12 @@ make_box(EggGroup *egg_group, EggGroup::CollideFlags flags,
}
EggVertex *vertex = (*vi);
LVertexd min_pd = vertex->get_pos3();
LVertexd max_pd = min_pd;
color = vertex->get_color();
LPoint3 min_pd = LCAST(PN_stdfloat, vertex->get_pos3()) * xform;
LPoint3 max_pd = min_pd;
for (++vi; vi != vertices.end(); ++vi) {
vertex = (*vi);
const LVertexd &pos = vertex->get_pos3();
LPoint3 pos = LCAST(PN_stdfloat, vertex->get_pos3()) * xform;
min_pd.set(min(min_pd[0], pos[0]),
min(min_pd[1], pos[1]),
min(min_pd[2], pos[2]));
@ -2817,13 +2817,25 @@ make_box(EggGroup *egg_group, EggGroup::CollideFlags flags,
max(max_pd[2], pos[2]));
}
min_p = LCAST(PN_stdfloat, min_pd);
max_p = LCAST(PN_stdfloat, max_pd);
min_p = min_pd;
max_p = max_pd;
return (min_pd != max_pd);
}
return false;
}
/**
* Creates a single generic Box corresponding to the polygons associated with
* this group. This box is used by make_collision_box.
*/
bool EggLoader::
make_box(EggGroup *egg_group, EggGroup::CollideFlags flags,
LPoint3 &min_p, LPoint3 &max_p, LColor &color) {
color.set(1.0, 1.0, 1.0, 1.0);
return make_box(egg_group, flags, LMatrix4::ident_mat(), min_p, max_p);
}
/**
* Creates CollisionSolids corresponding to the collision geometry indicated
* at the given node and below.
@ -2904,6 +2916,7 @@ make_collision_plane(EggGroup *egg_group, CollisionNode *cnode,
create_collision_plane(DCAST(EggPolygon, *ci), egg_group);
if (csplane != nullptr) {
apply_collision_flags(csplane, flags);
csplane->xform(cnode->get_transform()->get_mat());
cnode->add_solid(csplane);
return;
}
@ -3004,6 +3017,7 @@ make_collision_sphere(EggGroup *egg_group, CollisionNode *cnode,
CollisionSphere *cssphere =
new CollisionSphere(center, radius);
apply_collision_flags(cssphere, flags);
cssphere->xform(cnode->get_transform()->get_mat());
cnode->add_solid(cssphere);
}
}
@ -3017,8 +3031,8 @@ make_collision_box(EggGroup *egg_group, CollisionNode *cnode,
EggGroup::CollideFlags flags) {
LPoint3 min_p;
LPoint3 max_p;
LColor dummycolor;
if (make_box(egg_group, flags, min_p, max_p, dummycolor)) {
CPT(TransformState) transform = cnode->get_transform();
if (make_box(egg_group, flags, transform->get_mat(), min_p, max_p)) {
CollisionBox *csbox =
new CollisionBox(min_p, max_p);
apply_collision_flags(csbox, flags);
@ -3040,6 +3054,7 @@ make_collision_inv_sphere(EggGroup *egg_group, CollisionNode *cnode,
CollisionInvSphere *cssphere =
new CollisionInvSphere(center, radius);
apply_collision_flags(cssphere, flags);
cssphere->xform(cnode->get_transform()->get_mat());
cnode->add_solid(cssphere);
}
}
@ -3234,6 +3249,7 @@ make_collision_capsule(EggGroup *egg_group, CollisionNode *cnode,
new CollisionCapsule(LCAST(PN_stdfloat, point_a), LCAST(PN_stdfloat, point_b),
radius);
apply_collision_flags(cscapsule, flags);
cscapsule->xform(cnode->get_transform()->get_mat());
cnode->add_solid(cscapsule);
}
}
@ -3395,6 +3411,7 @@ create_collision_polygons(CollisionNode *cnode, EggPolygon *egg_poly,
new CollisionPolygon(vertices_begin, vertices_end);
if (cspoly->is_valid()) {
apply_collision_flags(cspoly, flags);
cspoly->xform(cnode->get_transform()->get_mat());
cnode->add_solid(cspoly);
}
}
@ -3485,6 +3502,7 @@ create_collision_floor_mesh(CollisionNode *cnode,
CollisionFloorMesh::TriangleIndices triangle = *ti;
csfloor->add_triangle(triangle.p1, triangle.p2, triangle.p3);
}
csfloor->xform(cnode->get_transform()->get_mat());
cnode->add_solid(csfloor);
}

2
panda/src/egg2pg/eggLoader.h
View File

@ -163,6 +163,8 @@ private:
bool make_sphere(EggGroup *start_group, EggGroup::CollideFlags flags,
LPoint3 &center, PN_stdfloat &radius, LColor &color);
bool make_box(EggGroup *start_group, EggGroup::CollideFlags flags,
const LMatrix4 &xform, LPoint3 &min_p, LPoint3 &max_p);
bool make_box(EggGroup *start_group, EggGroup::CollideFlags flags,
LPoint3 &min_p, LPoint3 &max_p, LColor &color);