[Curve3D] Fix middle point forward vector when control1=end and control2=begin; issue #88923

Co-authored-by: A Thousand Ships <96648715+AThousandShips@users.noreply.github.com>
2024-02-27 17:59:55 +01:00
parent 80a3d205f1
commit 1a91570ce9
3 changed files with 33 additions and 0 deletions
@@ -899,6 +899,10 @@ Vector2 Curve2D::_calculate_tangent(const Vector2 &p_begin, const Vector2 &p_con
 		}
 	}

+	if (p_control_1.is_equal_approx(p_end) && p_control_2.is_equal_approx(p_begin)) {
+		return (p_end - p_begin).normalized();
+	}
+
 	return p_begin.bezier_derivative(p_control_1, p_control_2, p_end, p_t).normalized();
 }

@@ -1648,6 +1652,10 @@ Vector3 Curve3D::_calculate_tangent(const Vector3 &p_begin, const Vector3 &p_con
 		}
 	}

+	if (p_control_1.is_equal_approx(p_end) && p_control_2.is_equal_approx(p_begin)) {
+		return (p_end - p_begin).normalized();
+	}
+
 	return p_begin.bezier_derivative(p_control_1, p_control_2, p_end, p_t).normalized();
 }