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Merge pull request #94479 from juanjp600/opt-in-path-rotation-tangent-fix

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Add flag to enable use of accurate path tangents for polygon rotation in `CSGPolygon3D`
This commit is contained in:
Thaddeus Crews 2025-01-20 16:25:49 -06:00
commit d9d705d8ab
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GPG key ID: 62181B86FE9E5D84
4 changed files with 179 additions and 26 deletions
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84
modules/csg/csg_shape.cpp
View file

@ -2234,24 +2234,35 @@ CSGBrush *CSGPolygon3D::_build_brush() {
base_xform = path->get_global_transform();
}
Vector3 current_point = curve->sample_baked(0);
Vector3 next_point = curve->sample_baked(extrusion_step);
Vector3 current_point;
Vector3 current_up = Vector3(0, 1, 0);
Vector3 direction = next_point - current_point;
if (path_joined) {
Vector3 last_point = curve->sample_baked(curve->get_baked_length());
direction = next_point - last_point;
}
Vector3 direction;
switch (path_rotation) {
case PATH_ROTATION_POLYGON:
current_point = curve->sample_baked(0);
direction = Vector3(0, 0, -1);
break;
case PATH_ROTATION_PATH:
break;
case PATH_ROTATION_PATH_FOLLOW:
current_up = curve->sample_baked_up_vector(0, true);
if (!path_rotation_accurate) {
current_point = curve->sample_baked(0);
Vector3 next_point = curve->sample_baked(extrusion_step);
direction = next_point - current_point;
if (path_joined) {
Vector3 last_point = curve->sample_baked(curve->get_baked_length());
direction = next_point - last_point;
}
} else {
Transform3D current_sample_xform = curve->sample_baked_with_rotation(0);
current_point = current_sample_xform.get_origin();
direction = current_sample_xform.get_basis().xform(Vector3(0, 0, -1));
}
if (path_rotation == PATH_ROTATION_PATH_FOLLOW) {
current_up = curve->sample_baked_up_vector(0, true);
}
break;
}
@ -2307,32 +2318,26 @@ CSGBrush *CSGPolygon3D::_build_brush() {
case MODE_PATH: {
double previous_offset = x0 * extrusion_step;
double current_offset = (x0 + 1) * extrusion_step;
double next_offset = (x0 + 2) * extrusion_step;
if (x0 == extrusions - 1) {
if (path_joined) {
current_offset = 0;
next_offset = extrusion_step;
} else {
next_offset = current_offset;
}
if (path_joined && x0 == extrusions - 1) {
current_offset = 0;
}
Vector3 previous_point = curve->sample_baked(previous_offset);
Vector3 current_point = curve->sample_baked(current_offset);
Vector3 next_point = curve->sample_baked(next_offset);
Transform3D current_sample_xform = curve->sample_baked_with_rotation(current_offset);
Vector3 current_point = current_sample_xform.get_origin();
Vector3 current_up = Vector3(0, 1, 0);
Vector3 direction = next_point - previous_point;
Vector3 current_dir = (current_point - previous_point).normalized();
Vector3 current_extrusion_dir = (current_point - previous_point).normalized();
Vector3 direction;
// If the angles are similar, remove the previous face and replace it with this one.
if (path_simplify_angle > 0.0 && x0 > 0 && previous_simplify_dir.dot(current_dir) > angle_simplify_dot) {
if (path_simplify_angle > 0.0 && x0 > 0 && previous_simplify_dir.dot(current_extrusion_dir) > angle_simplify_dot) {
faces_combined += 1;
previous_xform = previous_previous_xform;
face -= extrusion_face_count;
faces_removed += extrusion_face_count;
} else {
faces_combined = 0;
previous_simplify_dir = current_dir;
previous_simplify_dir = current_extrusion_dir;
}
switch (path_rotation) {
@ -2340,9 +2345,21 @@ CSGBrush *CSGPolygon3D::_build_brush() {
direction = Vector3(0, 0, -1);
break;
case PATH_ROTATION_PATH:
break;
case PATH_ROTATION_PATH_FOLLOW:
current_up = curve->sample_baked_up_vector(current_offset, true);
if (!path_rotation_accurate) {
double next_offset = (x0 + 2) * extrusion_step;
if (x0 == extrusions - 1) {
next_offset = path_joined ? extrusion_step : current_offset;
}
Vector3 next_point = curve->sample_baked(next_offset);
direction = next_point - previous_point;
} else {
direction = current_sample_xform.get_basis().xform(Vector3(0, 0, -1));
}
if (path_rotation == PATH_ROTATION_PATH_FOLLOW) {
current_up = curve->sample_baked_up_vector(current_offset, true);
}
break;
}
@ -2512,6 +2529,9 @@ void CSGPolygon3D::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_path_rotation", "path_rotation"), &CSGPolygon3D::set_path_rotation);
ClassDB::bind_method(D_METHOD("get_path_rotation"), &CSGPolygon3D::get_path_rotation);
ClassDB::bind_method(D_METHOD("set_path_rotation_accurate", "enable"), &CSGPolygon3D::set_path_rotation_accurate);
ClassDB::bind_method(D_METHOD("get_path_rotation_accurate"), &CSGPolygon3D::get_path_rotation_accurate);
ClassDB::bind_method(D_METHOD("set_path_local", "enable"), &CSGPolygon3D::set_path_local);
ClassDB::bind_method(D_METHOD("is_path_local"), &CSGPolygon3D::is_path_local);
@ -2543,6 +2563,7 @@ void CSGPolygon3D::_bind_methods() {
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "path_interval", PROPERTY_HINT_RANGE, "0.01,1.0,0.01,exp,or_greater"), "set_path_interval", "get_path_interval");
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "path_simplify_angle", PROPERTY_HINT_RANGE, "0.0,180.0,0.1"), "set_path_simplify_angle", "get_path_simplify_angle");
ADD_PROPERTY(PropertyInfo(Variant::INT, "path_rotation", PROPERTY_HINT_ENUM, "Polygon,Path,PathFollow"), "set_path_rotation", "get_path_rotation");
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "path_rotation_accurate"), "set_path_rotation_accurate", "get_path_rotation_accurate");
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "path_local"), "set_path_local", "is_path_local");
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "path_continuous_u"), "set_path_continuous_u", "is_path_continuous_u");
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "path_u_distance", PROPERTY_HINT_RANGE, "0.0,10.0,0.01,or_greater,suffix:m"), "set_path_u_distance", "get_path_u_distance");
@ -2685,6 +2706,16 @@ CSGPolygon3D::PathRotation CSGPolygon3D::get_path_rotation() const {
return path_rotation;
}
void CSGPolygon3D::set_path_rotation_accurate(bool p_enabled) {
path_rotation_accurate = p_enabled;
_make_dirty();
update_gizmos();
}
bool CSGPolygon3D::get_path_rotation_accurate() const {
return path_rotation_accurate;
}
void CSGPolygon3D::set_path_local(bool p_enable) {
path_local = p_enable;
_make_dirty();
@ -2746,6 +2777,7 @@ CSGPolygon3D::CSGPolygon3D() {
path_interval = 1.0;
path_simplify_angle = 0.0;
path_rotation = PATH_ROTATION_PATH_FOLLOW;
path_rotation_accurate = false;
path_local = false;
path_continuous_u = true;
path_u_distance = 1.0;

4
modules/csg/csg_shape.h
View file

@ -401,6 +401,7 @@ private:
float path_interval;
float path_simplify_angle;
PathRotation path_rotation;
bool path_rotation_accurate;
bool path_local;
Path3D *path = nullptr;
@ -452,6 +453,9 @@ public:
void set_path_rotation(PathRotation p_rotation);
PathRotation get_path_rotation() const;
void set_path_rotation_accurate(bool p_enable);
bool get_path_rotation_accurate() const;
void set_path_local(bool p_enable);
bool is_path_local() const;

3
modules/csg/doc_classes/CSGPolygon3D.xml
View file

@ -41,6 +41,9 @@
<member name="path_rotation" type="int" setter="set_path_rotation" getter="get_path_rotation" enum="CSGPolygon3D.PathRotation">
When [member mode] is [constant MODE_PATH], the path rotation method used to rotate the [member polygon] as it is extruded.
</member>
<member name="path_rotation_accurate" type="bool" setter="set_path_rotation_accurate" getter="get_path_rotation_accurate">
When [member mode] is [constant MODE_PATH], if [code]true[/code] the polygon will be rotated according to the proper tangent of the path at the sampled points. If [code]false[/code] an approximation is used, which decreases in accuracy as the number of subdivisions decreases.
</member>
<member name="path_simplify_angle" type="float" setter="set_path_simplify_angle" getter="get_path_simplify_angle">
When [member mode] is [constant MODE_PATH], extrusions that are less than this angle, will be merged together to reduce polygon count.
</member>

114
modules/csg/tests/test_csg.h Normal file
View file

@ -0,0 +1,114 @@
/**************************************************************************/
/* test_csg.h */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
#ifndef TEST_CSG_H
#define TEST_CSG_H
#include "../csg.h"
#include "../csg_shape.h"
#include "tests/test_macros.h"
namespace TestCSG {
TEST_CASE("[SceneTree][CSG] CSGPolygon3D") {
SUBCASE("[SceneTree][CSG] CSGPolygon3D: using accurate path tangent for polygon rotation") {
const float polygon_radius = 10.0f;
const Vector3 expected_min_bounds = Vector3(-polygon_radius, -polygon_radius, 0);
const Vector3 expected_max_bounds = Vector3(100 + polygon_radius, polygon_radius, 100);
const AABB expected_aabb = AABB(expected_min_bounds, expected_max_bounds - expected_min_bounds);
Ref<Curve3D> curve;
curve.instantiate();
curve->add_point(
// p_position
Vector3(0, 0, 0),
// p_in
Vector3(),
// p_out
Vector3(0, 0, 60));
curve->add_point(
// p_position
Vector3(100, 0, 100),
// p_in
Vector3(0, 0, -60),
// p_out
Vector3());
Path3D *path = memnew(Path3D);
path->set_curve(curve);
CSGPolygon3D *csg_polygon_3d = memnew(CSGPolygon3D);
SceneTree::get_singleton()->get_root()->add_child(csg_polygon_3d);
csg_polygon_3d->add_child(path);
csg_polygon_3d->set_path_node(csg_polygon_3d->get_path_to(path));
csg_polygon_3d->set_mode(CSGPolygon3D::Mode::MODE_PATH);
PackedVector2Array polygon;
polygon.append(Vector2(-polygon_radius, 0));
polygon.append(Vector2(0, polygon_radius));
polygon.append(Vector2(polygon_radius, 0));
polygon.append(Vector2(0, -polygon_radius));
csg_polygon_3d->set_polygon(polygon);
csg_polygon_3d->set_path_rotation(CSGPolygon3D::PathRotation::PATH_ROTATION_PATH);
csg_polygon_3d->set_path_rotation_accurate(true);
// Minimize the number of extrusions.
// This decreases the number of samples taken from the curve.
// Having fewer samples increases the inaccuracy of the line between samples as an approximation of the tangent of the curve.
// With correct polygon orientation, the bounding box for the given curve should be independent of the number of extrusions.
csg_polygon_3d->set_path_interval_type(CSGPolygon3D::PathIntervalType::PATH_INTERVAL_DISTANCE);
csg_polygon_3d->set_path_interval(1000.0f);
// Call get_brush_faces to force the bounding box to update.
csg_polygon_3d->get_brush_faces();
CHECK(csg_polygon_3d->get_aabb().is_equal_approx(expected_aabb));
// Perform the bounding box check again with a greater number of extrusions.
csg_polygon_3d->set_path_interval(1.0f);
csg_polygon_3d->get_brush_faces();
CHECK(csg_polygon_3d->get_aabb().is_equal_approx(expected_aabb));
csg_polygon_3d->remove_child(path);
SceneTree::get_singleton()->get_root()->remove_child(csg_polygon_3d);
memdelete(csg_polygon_3d);
memdelete(path);
}
}
} // namespace TestCSG
#endif // TEST_CSG_H