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Merge pull request #53272 from fabriceci/bug-platform-ceiling

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Fix #53255 when a body gets stuck when it hits a descending platform in 2D/3D
This commit is contained in:
Camille Mohr-Daurat 2021-09-30 18:05:52 -07:00 committed by GitHub
commit 95432893e2
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 38 additions and 2 deletions
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17
scene/2d/physics_body_2d.cpp
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@ -1131,6 +1131,8 @@ void CharacterBody2D::_move_and_slide_grounded(double p_delta, bool p_was_on_flo
bool sliding_enabled = !floor_stop_on_slope;
// Constant speed can be applied only the first time sliding is enabled.
bool can_apply_constant_speed = sliding_enabled;
// If the platform's ceiling push down the body.
bool apply_ceiling_velocity = false;
bool first_slide = true;
bool vel_dir_facing_up = motion_velocity.dot(up_direction) > 0;
Vector2 last_travel;
@ -1147,6 +1149,19 @@ void CharacterBody2D::_move_and_slide_grounded(double p_delta, bool p_was_on_flo
motion_results.push_back(result);
_set_collision_direction(result);
// If we hit a ceiling platform, we set the vertical motion_velocity to at least the platform one.
if (on_ceiling && result.collider_velocity != Vector2() && result.collider_velocity.dot(up_direction) < 0) {
// If ceiling sliding is on, only apply when the ceiling is flat or when the motion is upward.
if (!slide_on_ceiling || motion.dot(up_direction) < 0 || (result.collision_normal + up_direction).length() < 0.01) {
apply_ceiling_velocity = true;
Vector2 ceiling_vertical_velocity = up_direction * up_direction.dot(result.collider_velocity);
Vector2 motion_vertical_velocity = up_direction * up_direction.dot(motion_velocity);
if (motion_vertical_velocity.dot(up_direction) > 0 || ceiling_vertical_velocity.length_squared() > motion_vertical_velocity.length_squared()) {
motion_velocity = ceiling_vertical_velocity + motion_velocity.slide(up_direction);
}
}
}
if (on_floor && floor_stop_on_slope && (motion_velocity.normalized() + up_direction).length() < 0.01) {
Transform2D gt = get_global_transform();
if (result.travel.length() <= margin + CMP_EPSILON) {
@ -1200,7 +1215,7 @@ void CharacterBody2D::_move_and_slide_grounded(double p_delta, bool p_was_on_flo
motion = motion_slide_norm * (motion_slide_up.length() - result.travel.slide(up_direction).length() - last_travel.slide(up_direction).length());
}
// Regular sliding, the last part of the test handle the case when you don't want to slide on the ceiling.
else if ((sliding_enabled || !on_floor) && (!on_ceiling || slide_on_ceiling || !vel_dir_facing_up)) {
else if ((sliding_enabled || !on_floor) && (!on_ceiling || slide_on_ceiling || !vel_dir_facing_up) && !apply_ceiling_velocity) {
Vector2 slide_motion = result.remainder.slide(result.collision_normal);
if (slide_motion.dot(motion_velocity) > 0.0) {
motion = slide_motion;

21
scene/3d/physics_body_3d.cpp
View File

@ -1168,14 +1168,18 @@ void CharacterBody3D::_move_and_slide_grounded(double p_delta, bool p_was_on_flo
platform_rid = RID();
platform_velocity = Vector3();
platform_ceiling_velocity = Vector3();
floor_normal = Vector3();
wall_normal = Vector3();
ceiling_normal = Vector3();
// No sliding on first attempt to keep floor motion stable when possible,
// When stop on slope is enabled or when there is no up direction.
bool sliding_enabled = !floor_stop_on_slope;
// Constant speed can be applied only the first time sliding is enabled.
bool can_apply_constant_speed = sliding_enabled;
// If the platform's ceiling push down the body.
bool apply_ceiling_velocity = false;
bool first_slide = true;
bool vel_dir_facing_up = motion_velocity.dot(up_direction) > 0;
Vector3 total_travel;
@ -1193,6 +1197,19 @@ void CharacterBody3D::_move_and_slide_grounded(double p_delta, bool p_was_on_flo
CollisionState result_state;
_set_collision_direction(result, result_state);
// If we hit a ceiling platform, we set the vertical motion_velocity to at least the platform one.
if (collision_state.ceiling && platform_ceiling_velocity != Vector3() && platform_ceiling_velocity.dot(up_direction) < 0) {
// If ceiling sliding is on, only apply when the ceiling is flat or when the motion is upward.
if (!slide_on_ceiling || motion.dot(up_direction) < 0 || (ceiling_normal + up_direction).length() < 0.01) {
apply_ceiling_velocity = true;
Vector3 ceiling_vertical_velocity = up_direction * up_direction.dot(platform_ceiling_velocity);
Vector3 motion_vertical_velocity = up_direction * up_direction.dot(motion_velocity);
if (motion_vertical_velocity.dot(up_direction) > 0 || ceiling_vertical_velocity.length_squared() > motion_vertical_velocity.length_squared()) {
motion_velocity = ceiling_vertical_velocity + motion_velocity.slide(up_direction);
}
}
}
if (collision_state.floor && floor_stop_on_slope && (motion_velocity.normalized() + up_direction).length() < 0.01) {
Transform3D gt = get_global_transform();
if (result.travel.length() <= margin + CMP_EPSILON) {
@ -1304,7 +1321,7 @@ void CharacterBody3D::_move_and_slide_grounded(double p_delta, bool p_was_on_flo
if (apply_default_sliding) {
// Regular sliding, the last part of the test handle the case when you don't want to slide on the ceiling.
if ((sliding_enabled || !collision_state.floor) && (!collision_state.ceiling || slide_on_ceiling || !vel_dir_facing_up)) {
if ((sliding_enabled || !collision_state.floor) && (!collision_state.ceiling || slide_on_ceiling || !vel_dir_facing_up) && !apply_ceiling_velocity) {
const PhysicsServer3D::MotionCollision &collision = result.collisions[0];
Vector3 slide_motion = result.remainder.slide(collision.normal);
@ -1526,6 +1543,8 @@ void CharacterBody3D::_set_collision_direction(const PhysicsServer3D::MotionResu
if (ceiling_angle <= floor_max_angle + FLOOR_ANGLE_THRESHOLD) {
r_state.ceiling = true;
if (p_apply_state.ceiling) {
platform_ceiling_velocity = collision.collider_velocity;
ceiling_normal = collision.normal;
collision_state.ceiling = true;
}
continue;

2
scene/3d/physics_body_3d.h
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@ -392,8 +392,10 @@ private:
Vector3 motion_velocity;
Vector3 floor_normal;
Vector3 wall_normal;
Vector3 ceiling_normal;
Vector3 last_motion;
Vector3 platform_velocity;
Vector3 platform_ceiling_velocity;
Vector3 previous_position;
Vector3 real_velocity;