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Add poly triangulation order check, ensures faces do not flip on different order

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This commit is contained in:
Juan Linietsky 2018-04-28 12:59:45 -03:00
parent f8520dbba7
commit 1226720c01
1 changed files with 33 additions and 27 deletions
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60
modules/csg/csg_shape.cpp
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@ -1491,7 +1491,13 @@ CSGBrush *CSGPolygon::_build_brush() {
if (polygon.size() < 3)
return NULL;
Vector<int> triangles = Geometry::triangulate_polygon(polygon);
Vector<Point2> final_polygon = polygon;
if (Triangulate::get_area(final_polygon) > 0) {
final_polygon.invert();
}
Vector<int> triangles = Geometry::triangulate_polygon(final_polygon);
if (triangles.size() < 3)
return NULL;
@ -1535,12 +1541,12 @@ CSGBrush *CSGPolygon::_build_brush() {
int face_count;
switch (mode) {
case MODE_DEPTH: face_count = triangles.size() * 2 / 3 + (polygon.size()) * 2; break;
case MODE_SPIN: face_count = (spin_degrees < 360 ? triangles.size() * 2 / 3 : 0) + (polygon.size()) * 2 * spin_sides; break;
case MODE_DEPTH: face_count = triangles.size() * 2 / 3 + (final_polygon.size()) * 2; break;
case MODE_SPIN: face_count = (spin_degrees < 360 ? triangles.size() * 2 / 3 : 0) + (final_polygon.size()) * 2 * spin_sides; break;
case MODE_PATH: {
float bl = curve->get_baked_length();
int splits = MAX(2, Math::ceil(bl / path_interval));
face_count = triangles.size() * 2 / 3 + splits * polygon.size() * 2;
face_count = triangles.size() * 2 / 3 + splits * final_polygon.size() * 2;
} break;
}
@ -1580,7 +1586,7 @@ CSGBrush *CSGPolygon::_build_brush() {
for (int j = 0; j < triangles.size(); j += 3) {
for (int k = 0; k < 3; k++) {
int src[3] = { 0, i == 0 ? 1 : 2, i == 0 ? 2 : 1 };
Vector2 p = polygon[triangles[j + src[k]]];
Vector2 p = final_polygon[triangles[j + src[k]]];
Vector3 v = Vector3(p.x, p.y, 0);
if (i == 0) {
v.z -= depth;
@ -1596,15 +1602,15 @@ CSGBrush *CSGPolygon::_build_brush() {
}
//add triangles for depth
for (int i = 0; i < polygon.size(); i++) {
for (int i = 0; i < final_polygon.size(); i++) {
int i_n = (i + 1) % polygon.size();
int i_n = (i + 1) % final_polygon.size();
Vector3 v[4] = {
Vector3(polygon[i].x, polygon[i].y, -depth),
Vector3(polygon[i_n].x, polygon[i_n].y, -depth),
Vector3(polygon[i_n].x, polygon[i_n].y, 0),
Vector3(polygon[i].x, polygon[i].y, 0),
Vector3(final_polygon[i].x, final_polygon[i].y, -depth),
Vector3(final_polygon[i_n].x, final_polygon[i_n].y, -depth),
Vector3(final_polygon[i_n].x, final_polygon[i_n].y, 0),
Vector3(final_polygon[i].x, final_polygon[i].y, 0),
};
Vector2 u[4] = {
@ -1660,15 +1666,15 @@ CSGBrush *CSGPolygon::_build_brush() {
Vector3 normali_n = Vector3(Math::cos(angi_n), 0, Math::sin(angi_n));
//add triangles for depth
for (int j = 0; j < polygon.size(); j++) {
for (int j = 0; j < final_polygon.size(); j++) {
int j_n = (j + 1) % polygon.size();
int j_n = (j + 1) % final_polygon.size();
Vector3 v[4] = {
Vector3(normali.x * polygon[j].x, polygon[j].y, normali.z * polygon[j].x),
Vector3(normali.x * polygon[j_n].x, polygon[j_n].y, normali.z * polygon[j_n].x),
Vector3(normali_n.x * polygon[j_n].x, polygon[j_n].y, normali_n.z * polygon[j_n].x),
Vector3(normali_n.x * polygon[j].x, polygon[j].y, normali_n.z * polygon[j].x),
Vector3(normali.x * final_polygon[j].x, final_polygon[j].y, normali.z * final_polygon[j].x),
Vector3(normali.x * final_polygon[j_n].x, final_polygon[j_n].y, normali.z * final_polygon[j_n].x),
Vector3(normali_n.x * final_polygon[j_n].x, final_polygon[j_n].y, normali_n.z * final_polygon[j_n].x),
Vector3(normali_n.x * final_polygon[j].x, final_polygon[j].y, normali_n.z * final_polygon[j].x),
};
Vector2 u[4] = {
@ -1714,7 +1720,7 @@ CSGBrush *CSGPolygon::_build_brush() {
for (int j = 0; j < triangles.size(); j += 3) {
for (int k = 0; k < 3; k++) {
int src[3] = { 0, 2, 1 };
Vector2 p = polygon[triangles[j + src[k]]];
Vector2 p = final_polygon[triangles[j + src[k]]];
Vector3 v = Vector3(p.x, p.y, 0);
facesw[face * 3 + k] = v;
}
@ -1731,7 +1737,7 @@ CSGBrush *CSGPolygon::_build_brush() {
for (int j = 0; j < triangles.size(); j += 3) {
for (int k = 0; k < 3; k++) {
int src[3] = { 0, 1, 2 };
Vector2 p = polygon[triangles[j + src[k]]];
Vector2 p = final_polygon[triangles[j + src[k]]];
Vector3 v = Vector3(normali_n.x * p.x, p.y, normali_n.z * p.x);
facesw[face * 3 + k] = v;
}
@ -1793,15 +1799,15 @@ CSGBrush *CSGPolygon::_build_brush() {
if (i > 0) {
//put triangles where they belong
//add triangles for depth
for (int j = 0; j < polygon.size(); j++) {
for (int j = 0; j < final_polygon.size(); j++) {
int j_n = (j + 1) % polygon.size();
int j_n = (j + 1) % final_polygon.size();
Vector3 v[4] = {
prev_xf.xform(Vector3(polygon[j].x, polygon[j].y, 0)),
prev_xf.xform(Vector3(polygon[j_n].x, polygon[j_n].y, 0)),
xf.xform(Vector3(polygon[j_n].x, polygon[j_n].y, 0)),
xf.xform(Vector3(polygon[j].x, polygon[j].y, 0)),
prev_xf.xform(Vector3(final_polygon[j].x, final_polygon[j].y, 0)),
prev_xf.xform(Vector3(final_polygon[j_n].x, final_polygon[j_n].y, 0)),
xf.xform(Vector3(final_polygon[j_n].x, final_polygon[j_n].y, 0)),
xf.xform(Vector3(final_polygon[j].x, final_polygon[j].y, 0)),
};
Vector2 u[4] = {
@ -1848,7 +1854,7 @@ CSGBrush *CSGPolygon::_build_brush() {
for (int j = 0; j < triangles.size(); j += 3) {
for (int k = 0; k < 3; k++) {
int src[3] = { 0, 1, 2 };
Vector2 p = polygon[triangles[j + src[k]]];
Vector2 p = final_polygon[triangles[j + src[k]]];
Vector3 v = Vector3(p.x, p.y, 0);
facesw[face * 3 + k] = xf.xform(v);
}
@ -1865,7 +1871,7 @@ CSGBrush *CSGPolygon::_build_brush() {
for (int j = 0; j < triangles.size(); j += 3) {
for (int k = 0; k < 3; k++) {
int src[3] = { 0, 2, 1 };
Vector2 p = polygon[triangles[j + src[k]]];
Vector2 p = final_polygon[triangles[j + src[k]]];
Vector3 v = Vector3(p.x, p.y, 0);
facesw[face * 3 + k] = xf.xform(v);
}