Print better manifold errors and avoid crash on non manifold csg input.

* Manifold does not have a snap property.
* Tolerance means simplification amount.
* CSG snap has been removed
* Add better error messages.
* Verbose print manifold meshgl64 properties as json.

modules/csg/csg_shape.cpp

@@ -30,6 +30,7 @@
 
 #include "csg_shape.h"
 
+#include "core/io/json.h"
 #include "core/math/geometry_2d.h"
 
 #include <manifold/manifold.h>
@@ -142,6 +143,7 @@ bool CSGShape3D::is_root_shape() const {
 	return !parent_shape;
 }
 
+#ifndef DISABLE_DEPRECATED
 void CSGShape3D::set_snap(float p_snap) {
 	if (snap == p_snap) {
 		return;
@@ -154,6 +156,7 @@ void CSGShape3D::set_snap(float p_snap) {
 float CSGShape3D::get_snap() const {
 	return snap;
 }
+#endif // DISABLE_DEPRECATED
 
 void CSGShape3D::_make_dirty(bool p_parent_removing) {
 	if ((p_parent_removing || is_root_shape()) && !dirty) {
@@ -232,21 +235,116 @@ static void _unpack_manifold(
 	r_mesh_merge->_regen_face_aabbs();
 }
 
+// Errors matching `thirdparty/manifold/include/manifold/manifold.h`.
+static String manifold_error_to_string(const manifold::Manifold::Error &p_error) {
+	switch (p_error) {
+		case manifold::Manifold::Error::NoError:
+			return "No Error";
+		case manifold::Manifold::Error::NonFiniteVertex:
+			return "Non Finite Vertex";
+		case manifold::Manifold::Error::NotManifold:
+			return "Not Manifold";
+		case manifold::Manifold::Error::VertexOutOfBounds:
+			return "Vertex Out Of Bounds";
+		case manifold::Manifold::Error::PropertiesWrongLength:
+			return "Properties Wrong Length";
+		case manifold::Manifold::Error::MissingPositionProperties:
+			return "Missing Position Properties";
+		case manifold::Manifold::Error::MergeVectorsDifferentLengths:
+			return "Merge Vectors Different Lengths";
+		case manifold::Manifold::Error::MergeIndexOutOfBounds:
+			return "Merge Index Out Of Bounds";
+		case manifold::Manifold::Error::TransformWrongLength:
+			return "Transform Wrong Length";
+		case manifold::Manifold::Error::RunIndexWrongLength:
+			return "Run Index Wrong Length";
+		case manifold::Manifold::Error::FaceIDWrongLength:
+			return "Face ID Wrong Length";
+		case manifold::Manifold::Error::InvalidConstruction:
+			return "Invalid Construction";
+		default:
+			return "Unknown Error";
+	}
+}
+
+static String export_meshgl_as_json(const manifold::MeshGL64 &p_mesh) {
+	Dictionary mesh_dict;
+	mesh_dict["numProp"] = p_mesh.numProp;
+
+	Array vert_properties;
+	for (const double &val : p_mesh.vertProperties) {
+		vert_properties.append(val);
+	}
+	mesh_dict["vertProperties"] = vert_properties;
+
+	Array tri_verts;
+	for (const uint64_t &val : p_mesh.triVerts) {
+		tri_verts.append(val);
+	}
+	mesh_dict["triVerts"] = tri_verts;
+
+	Array merge_from_vert;
+	for (const uint64_t &val : p_mesh.mergeFromVert) {
+		merge_from_vert.append(val);
+	}
+	mesh_dict["mergeFromVert"] = merge_from_vert;
+
+	Array merge_to_vert;
+	for (const uint64_t &val : p_mesh.mergeToVert) {
+		merge_to_vert.append(val);
+	}
+	mesh_dict["mergeToVert"] = merge_to_vert;
+
+	Array run_index;
+	for (const uint64_t &val : p_mesh.runIndex) {
+		run_index.append(val);
+	}
+	mesh_dict["runIndex"] = run_index;
+
+	Array run_original_id;
+	for (const uint32_t &val : p_mesh.runOriginalID) {
+		run_original_id.append(val);
+	}
+	mesh_dict["runOriginalID"] = run_original_id;
+
+	Array run_transform;
+	for (const double &val : p_mesh.runTransform) {
+		run_transform.append(val);
+	}
+	mesh_dict["runTransform"] = run_transform;
+
+	Array face_id;
+	for (const uint64_t &val : p_mesh.faceID) {
+		face_id.append(val);
+	}
+	mesh_dict["faceID"] = face_id;
+
+	Array halfedge_tangent;
+	for (const double &val : p_mesh.halfedgeTangent) {
+		halfedge_tangent.append(val);
+	}
+	mesh_dict["halfedgeTangent"] = halfedge_tangent;
+
+	mesh_dict["tolerance"] = p_mesh.tolerance;
+
+	String json_string = JSON::stringify(mesh_dict);
+	return json_string;
+}
+
 static void _pack_manifold(
 		const CSGBrush *const p_mesh_merge,
 		manifold::Manifold &r_manifold,
 		HashMap<int32_t, Ref<Material>> &p_mesh_materials,
-		float p_snap) {
+		CSGShape3D *p_csg_shape) {
 	ERR_FAIL_NULL_MSG(p_mesh_merge, "p_mesh_merge is null");
-
+	ERR_FAIL_NULL_MSG(p_csg_shape, "p_shape is null");
 	HashMap<uint32_t, Vector<CSGBrush::Face>> faces_by_material;
 	for (int face_i = 0; face_i < p_mesh_merge->faces.size(); face_i++) {
 		const CSGBrush::Face &face = p_mesh_merge->faces[face_i];
 		faces_by_material[face.material].push_back(face);
 	}
 
 	manifold::MeshGL64 mesh;
-	mesh.tolerance = p_snap;
 	mesh.numProp = MANIFOLD_PROPERTY_MAX;
 	mesh.runOriginalID.reserve(faces_by_material.size());
 	mesh.runIndex.reserve(faces_by_material.size() + 1);
@@ -292,11 +390,18 @@ static void _pack_manifold(
 	// runIndex needs an explicit end value.
 	mesh.runIndex.push_back(mesh.triVerts.size());
 	ERR_FAIL_COND_MSG(mesh.vertProperties.size() % mesh.numProp != 0, "Invalid vertex properties size.");
+	print_verbose(export_meshgl_as_json(mesh));
 	mesh.Merge();
 	r_manifold = manifold::Manifold(mesh);
-	manifold::Manifold::Error err = r_manifold.Status();
-	if (err != manifold::Manifold::Error::NoError) {
-		print_error(String("Manifold creation from mesh failed:" + itos((int)err)));
+	manifold::Manifold::Error error = r_manifold.Status();
+	if (error == manifold::Manifold::Error::NoError) {
+		return;
+	}
+	if (p_csg_shape->get_owner()) {
+		NodePath path = p_csg_shape->get_owner()->get_path_to(p_csg_shape, true);
+		print_error(vformat("CSGShape3D manifold creation from mesh failed at %s: %s.", path, manifold_error_to_string(error)));
+	} else {
+		print_error(vformat("CSGShape3D manifold creation from mesh failed at .: %s.", manifold_error_to_string(error)));
 	}
 }
 
@@ -330,7 +435,7 @@ CSGBrush *CSGShape3D::_get_brush() {
 	CSGBrush *n = _build_brush();
 	HashMap<int32_t, Ref<Material>> mesh_materials;
 	manifold::Manifold root_manifold;
-	_pack_manifold(n, root_manifold, mesh_materials, get_snap());
+	_pack_manifold(n, root_manifold, mesh_materials, this);
 	manifold::OpType current_op = ManifoldOperation::convert_csg_op(get_operation());
 	std::vector<manifold::Manifold> manifolds;
 	manifolds.push_back(root_manifold);
@@ -346,7 +451,7 @@ CSGBrush *CSGShape3D::_get_brush() {
 		CSGBrush transformed_brush;
 		transformed_brush.copy_from(*child_brush, child->get_transform());
 		manifold::Manifold child_manifold;
-		_pack_manifold(&transformed_brush, child_manifold, mesh_materials, get_snap());
+		_pack_manifold(&transformed_brush, child_manifold, mesh_materials, child);
 		manifold::OpType child_operation = ManifoldOperation::convert_csg_op(child->get_operation());
 		if (child_operation != current_op) {
 			manifold::Manifold result = manifold::Manifold::BatchBoolean(manifolds, current_op);
@@ -834,8 +939,10 @@ void CSGShape3D::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_operation", "operation"), &CSGShape3D::set_operation);
 	ClassDB::bind_method(D_METHOD("get_operation"), &CSGShape3D::get_operation);
 
+#ifndef DISABLE_DEPRECATED
 	ClassDB::bind_method(D_METHOD("set_snap", "snap"), &CSGShape3D::set_snap);
 	ClassDB::bind_method(D_METHOD("get_snap"), &CSGShape3D::get_snap);
+#endif // DISABLE_DEPRECATED
 
 	ClassDB::bind_method(D_METHOD("set_use_collision", "operation"), &CSGShape3D::set_use_collision);
 	ClassDB::bind_method(D_METHOD("is_using_collision"), &CSGShape3D::is_using_collision);
@@ -864,7 +971,9 @@ void CSGShape3D::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("bake_collision_shape"), &CSGShape3D::bake_collision_shape);
 
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "operation", PROPERTY_HINT_ENUM, "Union,Intersection,Subtraction"), "set_operation", "get_operation");
-	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "snap", PROPERTY_HINT_RANGE, "0.000001,1,0.000001,suffix:m"), "set_snap", "get_snap");
+#ifndef DISABLE_DEPRECATED
+	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "snap", PROPERTY_HINT_RANGE, "0.000001,1,0.000001,suffix:m", PROPERTY_USAGE_NONE), "set_snap", "get_snap");
+#endif // DISABLE_DEPRECATED
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "calculate_tangents"), "set_calculate_tangents", "is_calculating_tangents");
 
 	ADD_GROUP("Collision", "collision_");

modules/csg/csg_shape.h

@@ -155,8 +155,10 @@ class CSGShape3D : public GeometryInstance3D {
 	void set_collision_priority(real_t p_priority);
 	real_t get_collision_priority() const;
 
+#ifndef DISABLE_DEPRECATED
 	void set_snap(float p_snap);
 	float get_snap() const;
+#endif // DISABLE_DEPRECATED
 
 	void set_calculate_tangents(bool p_calculate_tangents);
 	bool is_calculating_tangents() const;

modules/csg/doc_classes/CSGShape3D.xml

@@ -89,8 +89,8 @@
 		<member name="operation" type="int" setter="set_operation" getter="get_operation" enum="CSGShape3D.Operation" default="0">
 			The operation that is performed on this shape. This is ignored for the first CSG child node as the operation is between this node and the previous child of this nodes parent.
 		</member>
-		<member name="snap" type="float" setter="set_snap" getter="get_snap" default="0.001">
-			Snap makes the mesh vertices snap to a given distance so that the faces of two meshes can be perfectly aligned. A lower value results in greater precision but may be harder to adjust. The top-level CSG shape's snap value is used for the entire CSG tree.
+		<member name="snap" type="float" setter="set_snap" getter="get_snap" deprecated="The CSG library no longer uses snapping.">
+			This property does nothing.
 		</member>
 		<member name="use_collision" type="bool" setter="set_use_collision" getter="is_using_collision" default="false">
 			Adds a collision shape to the physics engine for our CSG shape. This will always act like a static body. Note that the collision shape is still active even if the CSG shape itself is hidden. See also [member collision_mask] and [member collision_priority].