Merge pull request #55402 from TokageItLab/fixed-immediatemesh-minimum-aabb

Fixed minimum size of `AABB` in `ImmediateMesh` to draw only one vertex

2 files changed, 4 insertions, 1 deletions

diff --git a/scene/resources/immediate_mesh.cpp b/scene/resources/immediate_mesh.cpp
index fe7124de9e..4f9a055bfb 100644
--- a/scene/resources/immediate_mesh.cpp
+++ b/scene/resources/immediate_mesh.cpp
@@ -144,6 +144,7 @@ void ImmediateMesh::surface_add_vertex_2d(const Vector2 &p_vertex) {
 
 	active_surface_data.vertex_2d = true;
 }
+
 void ImmediateMesh::surface_end() {
 	ERR_FAIL_COND_MSG(!surface_active, "Not creating any surface. Use surface_begin() to do it.");
 	ERR_FAIL_COND_MSG(!vertices.size(), "No vertices were added, surface can't be created.");
@@ -185,7 +186,7 @@ void ImmediateMesh::surface_end() {
 					vtx[2] = vertices[i].z;
 				}
 				if (i == 0) {
-					aabb.position = vertices[i];
+					aabb = AABB(vertices[i], SMALL_VEC3); // Must have a bit of size.
 				} else {
 					aabb.expand_to(vertices[i]);
 				}
diff --git a/scene/resources/immediate_mesh.h b/scene/resources/immediate_mesh.h
index 6673ee6f3d..92bf91441d 100644
--- a/scene/resources/immediate_mesh.h
+++ b/scene/resources/immediate_mesh.h
@@ -75,6 +75,8 @@ class ImmediateMesh : public Mesh {
 	Vector<uint8_t> surface_vertex_create_cache;
 	Vector<uint8_t> surface_attribute_create_cache;
 
+	const Vector3 SMALL_VEC3 = Vector3(CMP_EPSILON, CMP_EPSILON, CMP_EPSILON);
+
 protected:
 	static void _bind_methods();