Remove vector to_2d() + to_3d() methods

Semantics aren't obvious -- while Z component is the mathematically natural extension,
in Godot Y would be more typical (being the up/down axis in 3D). There's also the topic
of +/- signs... Maybe it can be re-added once there are clearer use cases.

Alternatively, a more flexible swizzle! macro supporting 0 when extending is possible.

godot-core/src/builtin/vectors/vector2.rs

@@ -11,7 +11,7 @@ use sys::{ffi_methods, GodotFfi};
 
 use crate::builtin::math::{FloatExt, GlamConv, GlamType};
 use crate::builtin::vectors::Vector2Axis;
-use crate::builtin::{inner, real, RAffine2, RVec2, Vector2i, Vector3};
+use crate::builtin::{inner, real, RAffine2, RVec2, Vector2i};
 
 use std::fmt;
 
@@ -44,7 +44,7 @@ use std::fmt;
 /// | 3D        | [`Vector3`][crate::builtin::Vector3] | [`Vector3i`][crate::builtin::Vector3i] |
 /// | 4D        | [`Vector4`][crate::builtin::Vector4] | [`Vector4i`][crate::builtin::Vector4i] |
 ///
-/// <br>You can convert to 3D vectors using [`to_3d(z)`][Self::to_3d], and to `Vector2i` using [`cast_int()`][Self::cast_int].
+/// <br>You can convert to `Vector2i` using [`cast_int()`][Self::cast_int].
 ///
 /// # Godot docs
 ///

godot-core/src/builtin/vectors/vector2i.rs

@@ -10,7 +10,7 @@ use std::cmp::Ordering;
 use sys::{ffi_methods, GodotFfi};
 
 use crate::builtin::math::{GlamConv, GlamType};
-use crate::builtin::{inner, real, RVec2, Vector2, Vector2Axis, Vector3i};
+use crate::builtin::{inner, real, RVec2, Vector2, Vector2Axis};
 
 use std::fmt;
 
@@ -42,7 +42,7 @@ use std::fmt;
 /// | 3D        | [`Vector3`][crate::builtin::Vector3] | [`Vector3i`][crate::builtin::Vector3i] |
 /// | 4D        | [`Vector4`][crate::builtin::Vector4] | [`Vector4i`][crate::builtin::Vector4i] |
 ///
-/// <br>You can convert to 3D vectors using [`to_3d(z)`][Self::to_3d], and to `Vector2` using [`cast_float()`][Self::cast_float].
+/// <br>You can convert to `Vector2` using [`cast_float()`][Self::cast_float].
 ///
 /// # Godot docs
 ///

godot-core/src/builtin/vectors/vector3.rs

@@ -45,7 +45,7 @@ use std::fmt;
 /// | 3D        | **`Vector3`**                        | [`Vector3i`][crate::builtin::Vector3i] |
 /// | 4D        | [`Vector4`][crate::builtin::Vector4] | [`Vector4i`][crate::builtin::Vector4i] |
 ///
-/// <br>You can convert to 2D vectors using [`to_2d()`][Self::to_2d], and to `Vector3i` using [`cast_int()`][Self::cast_int].
+/// <br>You can convert to `Vector3i` using [`cast_int()`][Self::cast_int].
 ///
 /// # Godot docs
 ///

godot-core/src/builtin/vectors/vector3i.rs

@@ -12,7 +12,7 @@ use godot_ffi as sys;
 use sys::{ffi_methods, GodotFfi};
 
 use crate::builtin::math::{GlamConv, GlamType};
-use crate::builtin::{inner, real, RVec3, Vector2i, Vector3, Vector3Axis};
+use crate::builtin::{inner, real, RVec3, Vector3, Vector3Axis};
 
 /// Vector used for 3D math using integer coordinates.
 ///
@@ -42,7 +42,7 @@ use crate::builtin::{inner, real, RVec3, Vector2i, Vector3, Vector3Axis};
 /// | 3D        | [`Vector3`][crate::builtin::Vector3] | **`Vector3i`**                         |
 /// | 4D        | [`Vector4`][crate::builtin::Vector4] | [`Vector4i`][crate::builtin::Vector4i] |
 ///
-/// <br>You can convert to 2D vectors using [`to_2d()`][Self::to_2d], and to `Vector3` using [`cast_float()`][Self::cast_float].
+/// <br>You can convert to `Vector3` using [`cast_float()`][Self::cast_float].
 ///
 /// # Godot docs
 ///

godot-core/src/builtin/vectors/vector_macros.rs

@@ -791,12 +791,6 @@ macro_rules! impl_vector2x_fns {
         /// # 2D functions
         /// The following methods are only available on 2D vectors (for both float and int).
         impl $Vector {
-            /// Increases dimension to 3D, accepting a new value for the Z component.
-            #[inline]
-            pub fn to_3d(self, z: $Scalar) -> $Vector3D {
-                <$Vector3D>::new(self.x, self.y, z)
-            }
-
             /// Returns the aspect ratio of this vector, the ratio of [`Self::x`] to [`Self::y`].
             #[inline]
             pub fn aspect(self) -> real {
@@ -853,15 +847,6 @@ macro_rules! impl_vector3x_fns {
         /// # 3D functions
         /// The following methods are only available on 3D vectors (for both float and int).
         impl $Vector {
-            /// Reduces dimension to 2D, discarding the Z component.
-            ///
-            /// See also [`swizzle!`][crate::builtin::swizzle] for a more general way to extract components.
-            /// `self.to_2d()` is equivalent to `swizzle!(self => x, y)`.
-            #[inline]
-            pub fn to_2d(self) -> $Vector2D {
-                <$Vector2D>::new(self.x, self.y)
-            }
-
             /// Returns the axis of the vector's highest value. See [`Vector3Axis`] enum. If all components are equal, this method returns [`None`].
             ///
             /// To mimic Godot's behavior, unwrap this function's result with `unwrap_or(Vector3Axis::X)`.