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Enabled area-specific wind forces

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This commit is contained in:
Jeffrey Cochran 2021-07-20 00:23:32 -04:00
parent d5a30431b9
commit e806397196
10 changed files with 224 additions and 19 deletions
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9
doc/classes/Area3D.xml
View file

@ -92,6 +92,15 @@
<member name="space_override" type="int" setter="set_space_override_mode" getter="get_space_override_mode" enum="Area3D.SpaceOverride" default="0">
Override mode for gravity and damping calculations within this area. See [enum SpaceOverride] for possible values.
</member>
<member name="wind_attenuation_factor" type="float" setter="set_wind_attenuation_factor" getter="get_wind_attenuation_factor" default="0.0">
The exponential rate at which wind force decreases with distance from its origin.
</member>
<member name="wind_force_magnitude" type="float" setter="set_wind_force_magnitude" getter="get_wind_force_magnitude" default="0.0">
The magnitude of area-specific wind force.
</member>
<member name="wind_source_path" type="NodePath" setter="set_wind_source_path" getter="get_wind_source_path" default="NodePath(&quot;&quot;)">
The [Node3D] which is used to specify the the direction and origin of an area-specific wind force. The direction is opposite to the z-axis of the [Node3D]'s local transform, and its origin is the origin of the [Node3D]'s local transform.
</member>
</members>
<signals>
<signal name="area_entered">

12
doc/classes/PhysicsServer3D.xml
View file

@ -1222,6 +1222,18 @@
<constant name="AREA_PARAM_PRIORITY" value="7" enum="AreaParameter">
Constant to set/get the priority (order of processing) of an area.
</constant>
<constant name="AREA_PARAM_WIND_FORCE_MAGNITUDE" value="8" enum="AreaParameter">
Constant to set/get the magnitude of area-specific wind force.
</constant>
<constant name="AREA_PARAM_WIND_SOURCE" value="9" enum="AreaParameter">
Constant to set/get the 3D vector that specifies the origin from which an area-specific wind blows.
</constant>
<constant name="AREA_PARAM_WIND_DIRECTION" value="10" enum="AreaParameter">
Constant to set/get the 3D vector that specifies the direction in which an area-specific wind blows.
</constant>
<constant name="AREA_PARAM_WIND_ATTENUATION_FACTOR" value="11" enum="AreaParameter">
Constant to set/get the exponential rate at which wind force decreases with distance from its origin.
</constant>
<constant name="AREA_SPACE_OVERRIDE_DISABLED" value="0" enum="AreaSpaceOverrideMode">
This area does not affect gravity/damp. These are generally areas that exist only to detect collisions, and objects entering or exiting them.
</constant>

69
scene/3d/area_3d.cpp
View file

@ -105,6 +105,61 @@ real_t Area3D::get_priority() const {
return priority;
}
void Area3D::set_wind_force_magnitude(real_t p_wind_force_magnitude) {
wind_force_magnitude = p_wind_force_magnitude;
if (is_inside_tree()) {
_initialize_wind();
}
}
real_t Area3D::get_wind_force_magnitude() const {
return wind_force_magnitude;
}
void Area3D::set_wind_attenuation_factor(real_t p_wind_force_attenuation_factor) {
wind_attenuation_factor = p_wind_force_attenuation_factor;
if (is_inside_tree()) {
_initialize_wind();
}
}
real_t Area3D::get_wind_attenuation_factor() const {
return wind_attenuation_factor;
}
void Area3D::set_wind_source_path(const NodePath &p_wind_source_path) {
wind_source_path = p_wind_source_path;
if (is_inside_tree()) {
_initialize_wind();
}
}
const NodePath &Area3D::get_wind_source_path() const {
return wind_source_path;
}
void Area3D::_initialize_wind() {
real_t temp_magnitude = 0.0;
Vector3 wind_direction(0., 0., 0.);
Vector3 wind_source(0., 0., 0.);
// Overwrite with area-specified info if available
if (!wind_source_path.is_empty()) {
Node3D *p_wind_source = Object::cast_to<Node3D>(get_node(wind_source_path));
ERR_FAIL_NULL(p_wind_source);
Transform3D global_transform = p_wind_source->get_transform();
wind_direction = -global_transform.basis.get_axis(Vector3::AXIS_Z).normalized();
wind_source = global_transform.origin;
temp_magnitude = wind_force_magnitude;
}
// Set force, source and direction in the physics server.
PhysicsServer3D::get_singleton()->area_set_param(get_rid(), PhysicsServer3D::AREA_PARAM_WIND_ATTENUATION_FACTOR, wind_attenuation_factor);
PhysicsServer3D::get_singleton()->area_set_param(get_rid(), PhysicsServer3D::AREA_PARAM_WIND_SOURCE, wind_source);
PhysicsServer3D::get_singleton()->area_set_param(get_rid(), PhysicsServer3D::AREA_PARAM_WIND_DIRECTION, wind_direction);
PhysicsServer3D::get_singleton()->area_set_param(get_rid(), PhysicsServer3D::AREA_PARAM_WIND_FORCE_MAGNITUDE, temp_magnitude);
}
void Area3D::_body_enter_tree(ObjectID p_id) {
Object *obj = ObjectDB::get_instance(p_id);
Node *node = Object::cast_to<Node>(obj);
@ -264,6 +319,8 @@ void Area3D::_clear_monitoring() {
void Area3D::_notification(int p_what) {
if (p_what == NOTIFICATION_EXIT_TREE) {
_clear_monitoring();
} else if (p_what == NOTIFICATION_ENTER_TREE) {
_initialize_wind();
}
}
@ -550,6 +607,15 @@ void Area3D::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_priority", "priority"), &Area3D::set_priority);
ClassDB::bind_method(D_METHOD("get_priority"), &Area3D::get_priority);
ClassDB::bind_method(D_METHOD("set_wind_force_magnitude", "wind_force_magnitude"), &Area3D::set_wind_force_magnitude);
ClassDB::bind_method(D_METHOD("get_wind_force_magnitude"), &Area3D::get_wind_force_magnitude);
ClassDB::bind_method(D_METHOD("set_wind_attenuation_factor", "wind_attenuation_factor"), &Area3D::set_wind_attenuation_factor);
ClassDB::bind_method(D_METHOD("get_wind_attenuation_factor"), &Area3D::get_wind_attenuation_factor);
ClassDB::bind_method(D_METHOD("set_wind_source_path", "wind_source_path"), &Area3D::set_wind_source_path);
ClassDB::bind_method(D_METHOD("get_wind_source_path"), &Area3D::get_wind_source_path);
ClassDB::bind_method(D_METHOD("set_monitorable", "enable"), &Area3D::set_monitorable);
ClassDB::bind_method(D_METHOD("is_monitorable"), &Area3D::is_monitorable);
@ -605,6 +671,9 @@ void Area3D::_bind_methods() {
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "gravity", PROPERTY_HINT_RANGE, "-32,32,0.001,or_lesser,or_greater"), "set_gravity", "get_gravity");
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "linear_damp", PROPERTY_HINT_RANGE, "0,100,0.001,or_greater"), "set_linear_damp", "get_linear_damp");
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "angular_damp", PROPERTY_HINT_RANGE, "0,100,0.001,or_greater"), "set_angular_damp", "get_angular_damp");
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "wind_force_magnitude", PROPERTY_HINT_RANGE, "0,10,0.001,or_greater"), "set_wind_force_magnitude", "get_wind_force_magnitude");
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "wind_attenuation_factor", PROPERTY_HINT_RANGE, "0.0,3.0,0.001,or_greater"), "set_wind_attenuation_factor", "get_wind_attenuation_factor");
ADD_PROPERTY(PropertyInfo(Variant::NODE_PATH, "wind_source_path", PROPERTY_HINT_NODE_PATH_VALID_TYPES, "Node3D"), "set_wind_source_path", "get_wind_source_path");
ADD_GROUP("Audio Bus", "audio_bus_");
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "audio_bus_override"), "set_audio_bus_override", "is_overriding_audio_bus");

14
scene/3d/area_3d.h
View file

@ -55,6 +55,9 @@ private:
real_t angular_damp = 0.1;
real_t linear_damp = 0.1;
int priority = 0;
real_t wind_force_magnitude = 0.0;
real_t wind_attenuation_factor = 0.0;
NodePath wind_source_path;
bool monitoring = false;
bool monitorable = false;
bool locked = false;
@ -134,6 +137,8 @@ private:
void _validate_property(PropertyInfo &property) const override;
void _initialize_wind();
protected:
void _notification(int p_what);
static void _bind_methods();
@ -163,6 +168,15 @@ public:
void set_priority(real_t p_priority);
real_t get_priority() const;
void set_wind_force_magnitude(real_t p_wind_force_magnitude);
real_t get_wind_force_magnitude() const;
void set_wind_attenuation_factor(real_t p_wind_attenuation_factor);
real_t get_wind_attenuation_factor() const;
void set_wind_source_path(const NodePath &p_wind_source_path);
const NodePath &get_wind_source_path() const;
void set_monitoring(bool p_enable);
bool is_monitoring() const;

22
servers/physics_3d/area_3d_sw.cpp
View file

@ -163,6 +163,20 @@ void Area3DSW::set_param(PhysicsServer3D::AreaParameter p_param, const Variant &
case PhysicsServer3D::AREA_PARAM_PRIORITY:
priority = p_value;
break;
case PhysicsServer3D::AREA_PARAM_WIND_FORCE_MAGNITUDE:
ERR_FAIL_COND_MSG(wind_force_magnitude < 0, "Wind force magnitude must be a non-negative real number, but a negative number was specified.");
wind_force_magnitude = p_value;
break;
case PhysicsServer3D::AREA_PARAM_WIND_SOURCE:
wind_source = p_value;
break;
case PhysicsServer3D::AREA_PARAM_WIND_DIRECTION:
wind_direction = p_value;
break;
case PhysicsServer3D::AREA_PARAM_WIND_ATTENUATION_FACTOR:
ERR_FAIL_COND_MSG(wind_attenuation_factor < 0, "Wind attenuation factor must be a non-negative real number, but a negative number was specified.");
wind_attenuation_factor = p_value;
break;
}
}
@ -184,6 +198,14 @@ Variant Area3DSW::get_param(PhysicsServer3D::AreaParameter p_param) const {
return angular_damp;
case PhysicsServer3D::AREA_PARAM_PRIORITY:
return priority;
case PhysicsServer3D::AREA_PARAM_WIND_FORCE_MAGNITUDE:
return wind_force_magnitude;
case PhysicsServer3D::AREA_PARAM_WIND_SOURCE:
return wind_source;
case PhysicsServer3D::AREA_PARAM_WIND_DIRECTION:
return wind_direction;
case PhysicsServer3D::AREA_PARAM_WIND_ATTENUATION_FACTOR:
return wind_attenuation_factor;
}
return Variant();

16
servers/physics_3d/area_3d_sw.h
View file

@ -50,6 +50,10 @@ class Area3DSW : public CollisionObject3DSW {
real_t point_attenuation;
real_t linear_damp;
real_t angular_damp;
real_t wind_force_magnitude = 0.0;
real_t wind_attenuation_factor = 0.0;
Vector3 wind_source;
Vector3 wind_direction;
int priority;
bool monitorable;
@ -154,6 +158,18 @@ public:
_FORCE_INLINE_ void set_priority(int p_priority) { priority = p_priority; }
_FORCE_INLINE_ int get_priority() const { return priority; }
_FORCE_INLINE_ void set_wind_force_magnitude(real_t p_wind_force_magnitude) { wind_force_magnitude = p_wind_force_magnitude; }
_FORCE_INLINE_ real_t get_wind_force_magnitude() const { return wind_force_magnitude; }
_FORCE_INLINE_ void set_wind_attenuation_factor(real_t p_wind_attenuation_factor) { wind_attenuation_factor = p_wind_attenuation_factor; }
_FORCE_INLINE_ real_t get_wind_attenuation_factor() const { return wind_attenuation_factor; }
_FORCE_INLINE_ void set_wind_source(const Vector3 &p_wind_source) { wind_source = p_wind_source; }
_FORCE_INLINE_ const Vector3 &get_wind_source() const { return wind_source; }
_FORCE_INLINE_ void set_wind_direction(const Vector3 &p_wind_direction) { wind_direction = p_wind_direction; }
_FORCE_INLINE_ const Vector3 &get_wind_direction() const { return wind_direction; }
_FORCE_INLINE_ void add_constraint(Constraint3DSW *p_constraint) { constraints.insert(p_constraint); }
_FORCE_INLINE_ void remove_constraint(Constraint3DSW *p_constraint) { constraints.erase(p_constraint); }
_FORCE_INLINE_ const Set<Constraint3DSW *> &get_constraints() const { return constraints; }

85
servers/physics_3d/soft_body_3d_sw.cpp
View file

@ -165,7 +165,7 @@ void SoftBody3DSW::update_rendering_server(RenderingServerHandler *p_rendering_s
p_rendering_server_handler->set_aabb(bounds);
}
void SoftBody3DSW::update_normals() {
void SoftBody3DSW::update_normals_and_centroids() {
uint32_t i, ni;
for (i = 0, ni = nodes.size(); i < ni; ++i) {
@ -180,6 +180,7 @@ void SoftBody3DSW::update_normals() {
face.n[2]->n += n;
face.normal = n;
face.normal.normalize();
face.centroid = 0.33333333333 * (face.n[0]->x + face.n[1]->x + face.n[2]->x);
}
for (i = 0, ni = nodes.size(); i < ni; ++i) {
@ -310,7 +311,7 @@ void SoftBody3DSW::apply_nodes_transform(const Transform3D &p_transform) {
face_tree.clear();
update_normals();
update_normals_and_centroids();
update_bounds();
update_constants();
}
@ -574,7 +575,7 @@ bool SoftBody3DSW::create_from_trimesh(const Vector<int> &p_indices, const Vecto
reoptimize_link_order();
update_constants();
update_normals();
update_normals_and_centroids();
update_bounds();
return true;
@ -898,32 +899,66 @@ void SoftBody3DSW::add_velocity(const Vector3 &p_velocity) {
}
}
void SoftBody3DSW::apply_forces() {
if (pressure_coefficient < CMP_EPSILON) {
return;
}
void SoftBody3DSW::apply_forces(bool p_has_wind_forces) {
int ac = areas.size();
if (nodes.is_empty()) {
return;
}
uint32_t i, ni;
int32_t j;
// Calculate volume.
real_t volume = 0.0;
const Vector3 &org = nodes[0].x;
// Iterate over faces (try not to iterate elsewhere if possible).
for (i = 0, ni = faces.size(); i < ni; ++i) {
bool stopped = false;
const Face &face = faces[i];
Vector3 wind_force(0, 0, 0);
// Compute volume.
volume += vec3_dot(face.n[0]->x - org, vec3_cross(face.n[1]->x - org, face.n[2]->x - org));
// Compute nodal forces from area winds.
if (ac && p_has_wind_forces) {
const AreaCMP *aa = &areas[0];
for (j = ac - 1; j >= 0 && !stopped; j--) {
PhysicsServer3D::AreaSpaceOverrideMode mode = aa[j].area->get_space_override_mode();
switch (mode) {
case PhysicsServer3D::AREA_SPACE_OVERRIDE_COMBINE:
case PhysicsServer3D::AREA_SPACE_OVERRIDE_COMBINE_REPLACE: {
wind_force += _compute_area_windforce(aa[j].area, &face);
stopped = mode == PhysicsServer3D::AREA_SPACE_OVERRIDE_COMBINE_REPLACE;
} break;
case PhysicsServer3D::AREA_SPACE_OVERRIDE_REPLACE:
case PhysicsServer3D::AREA_SPACE_OVERRIDE_REPLACE_COMBINE: {
wind_force = _compute_area_windforce(aa[j].area, &face);
stopped = mode == PhysicsServer3D::AREA_SPACE_OVERRIDE_REPLACE;
} break;
default: {
}
}
}
for (j = 0; j < 3; j++) {
Node *current_node = face.n[j];
current_node->f += wind_force;
}
}
}
volume /= 6.0;
// Apply per node forces.
real_t ivolumetp = 1.0 / Math::abs(volume) * pressure_coefficient;
for (i = 0, ni = nodes.size(); i < ni; ++i) {
Node &node = nodes[i];
if (node.im > 0) {
node.f += node.n * (node.area * ivolumetp);
// Apply nodal pressure forces.
if (pressure_coefficient > CMP_EPSILON) {
real_t ivolumetp = 1.0 / Math::abs(volume) * pressure_coefficient;
for (i = 0, ni = nodes.size(); i < ni; ++i) {
Node &node = nodes[i];
if (node.im > 0) {
node.f += node.n * (node.area * ivolumetp);
}
}
}
}
@ -941,6 +976,18 @@ void SoftBody3DSW::_compute_area_gravity(const Area3DSW *p_area) {
}
}
Vector3 SoftBody3DSW::_compute_area_windforce(const Area3DSW *p_area, const Face *p_face) {
real_t wfm = p_area->get_wind_force_magnitude();
real_t waf = p_area->get_wind_attenuation_factor();
const Vector3 &wd = p_area->get_wind_direction();
const Vector3 &ws = p_area->get_wind_source();
real_t projection_on_tri_normal = vec3_dot(p_face->normal, wd);
real_t projection_toward_centroid = vec3_dot(p_face->centroid - ws, wd);
real_t attenuation_over_distance = pow(projection_toward_centroid, -waf);
real_t nodal_force_magnitude = wfm * 0.33333333333 * p_face->ra * projection_on_tri_normal * attenuation_over_distance;
return nodal_force_magnitude * p_face->normal;
}
void SoftBody3DSW::predict_motion(real_t p_delta) {
const real_t inv_delta = 1.0 / p_delta;
@ -952,11 +999,15 @@ void SoftBody3DSW::predict_motion(real_t p_delta) {
int ac = areas.size();
bool stopped = false;
bool has_wind_forces = false;
if (ac) {
areas.sort();
const AreaCMP *aa = &areas[0];
for (int i = ac - 1; i >= 0 && !stopped; i--) {
// Avoids unnecessary loop in apply_forces().
has_wind_forces = has_wind_forces || aa[i].area->get_wind_force_magnitude() > CMP_EPSILON;
PhysicsServer3D::AreaSpaceOverrideMode mode = aa[i].area->get_space_override_mode();
switch (mode) {
case PhysicsServer3D::AREA_SPACE_OVERRIDE_COMBINE:
@ -978,7 +1029,9 @@ void SoftBody3DSW::predict_motion(real_t p_delta) {
// Apply forces.
add_velocity(gravity * p_delta);
apply_forces();
if (pressure_coefficient > CMP_EPSILON || has_wind_forces) {
apply_forces(has_wind_forces);
}
// Avoid soft body from 'exploding' so use some upper threshold of maximum motion
// that a node can travel per frame.
@ -1057,7 +1110,7 @@ void SoftBody3DSW::solve_constraints(real_t p_delta) {
node.q = node.x;
}
update_normals();
update_normals_and_centroids();
}
void SoftBody3DSW::solve_links(real_t kst, real_t ti) {

6
servers/physics_3d/soft_body_3d_sw.h
View file

@ -71,6 +71,7 @@ class SoftBody3DSW : public CollisionObject3DSW {
};
struct Face {
Vector3 centroid;
Node *n[3] = { nullptr, nullptr, nullptr }; // Node pointers
Vector3 normal; // Normal
real_t ra = 0.0; // Rest area
@ -114,6 +115,7 @@ class SoftBody3DSW : public CollisionObject3DSW {
uint64_t island_step = 0;
_FORCE_INLINE_ void _compute_area_gravity(const Area3DSW *p_area);
_FORCE_INLINE_ Vector3 _compute_area_windforce(const Area3DSW *p_area, const Face *p_face);
public:
SoftBody3DSW();
@ -220,7 +222,7 @@ protected:
virtual void _shapes_changed();
private:
void update_normals();
void update_normals_and_centroids();
void update_bounds();
void update_constants();
void update_area();
@ -231,7 +233,7 @@ private:
void add_velocity(const Vector3 &p_velocity);
void apply_forces();
void apply_forces(bool p_has_wind_forces);
bool create_from_trimesh(const Vector<int> &p_indices, const Vector<Vector3> &p_vertices);
void generate_bending_constraints(int p_distance);

4
servers/physics_server_3d.cpp
View file

@ -766,6 +766,10 @@ void PhysicsServer3D::_bind_methods() {
BIND_ENUM_CONSTANT(AREA_PARAM_LINEAR_DAMP);
BIND_ENUM_CONSTANT(AREA_PARAM_ANGULAR_DAMP);
BIND_ENUM_CONSTANT(AREA_PARAM_PRIORITY);
BIND_ENUM_CONSTANT(AREA_PARAM_WIND_FORCE_MAGNITUDE);
BIND_ENUM_CONSTANT(AREA_PARAM_WIND_SOURCE);
BIND_ENUM_CONSTANT(AREA_PARAM_WIND_DIRECTION);
BIND_ENUM_CONSTANT(AREA_PARAM_WIND_ATTENUATION_FACTOR);
BIND_ENUM_CONSTANT(AREA_SPACE_OVERRIDE_DISABLED);
BIND_ENUM_CONSTANT(AREA_SPACE_OVERRIDE_COMBINE);

6
servers/physics_server_3d.h
View file

@ -298,7 +298,11 @@ public:
AREA_PARAM_GRAVITY_POINT_ATTENUATION,
AREA_PARAM_LINEAR_DAMP,
AREA_PARAM_ANGULAR_DAMP,
AREA_PARAM_PRIORITY
AREA_PARAM_PRIORITY,
AREA_PARAM_WIND_FORCE_MAGNITUDE,
AREA_PARAM_WIND_SOURCE,
AREA_PARAM_WIND_DIRECTION,
AREA_PARAM_WIND_ATTENUATION_FACTOR,
};
virtual RID area_create() = 0;