Fix order of transforms.

samples/RenderDemo/Pages/Transform3DPage.axaml

@@ -2,7 +2,7 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="650"
              x:Class="RenderDemo.Pages.Transform3DPage">
     <UserControl.Styles>
     <Styles>

src/Avalonia.Visuals/Media/Transform3D.cs

@@ -154,6 +154,13 @@ public class Transform3D : Transform
                     matrix44 *= Matrix4x4.CreateRotationY((float)Matrix.ToRadians(RotationY));
                     matrix44 *= Matrix4x4.CreateRotationZ((float)Matrix.ToRadians(RotationZ));
 
+                    matrix44 *= Matrix4x4.CreateTranslation((float)CenterX, (float)CenterY, (float)CenterZ);
+                    
+                    var perspectiveMatrix = Matrix4x4.Identity;
+                    perspectiveMatrix.M34 = -1 / (float)50;
+                    
+                    matrix44 *= perspectiveMatrix;
+
                     var matrix = new Matrix(
                         matrix44.M11,
                         matrix44.M12,