Node that instances meshes into a scenario. MeshInstance3D is a node that takes a [Mesh] resource and adds it to the current scenario by creating an instance of it. This is the class most often used render 3D geometry and can be used to instance a single [Mesh] in many places. This allows reusing geometry, which can save on resources. When a [Mesh] has to be instantiated more than thousands of times at close proximity, consider using a [MultiMesh] in a [MultiMeshInstance3D] instead. https://godotengine.org/asset-library/asset/123 https://godotengine.org/asset-library/asset/126 https://godotengine.org/asset-library/asset/125 https://godotengine.org/asset-library/asset/678 This helper creates a [StaticBody3D] child node with a [ConvexPolygonShape3D] collision shape calculated from the mesh geometry. It's mainly used for testing. If [param clean] is [code]true[/code] (default), duplicate and interior vertices are removed automatically. You can set it to [code]false[/code] to make the process faster if not needed. If [param simplify] is [code]true[/code], the geometry can be further simplified to reduce the number of vertices. Disabled by default. This helper creates a [MeshInstance3D] child node with gizmos at every vertex calculated from the mesh geometry. It's mainly used for testing. This helper creates a [StaticBody3D] child node with multiple [ConvexPolygonShape3D] collision shapes calculated from the mesh geometry via convex decomposition. It's mainly used for testing. This helper creates a [StaticBody3D] child node with a [ConcavePolygonShape3D] collision shape calculated from the mesh geometry. It's mainly used for testing. Returns the index of the blend shape with the given [param name]. Returns [code]-1[/code] if no blend shape with this name exists, including when [member mesh] is [code]null[/code]. Returns the [Material] that will be used by the [Mesh] when drawing. This can return the [member GeometryInstance3D.material_override], the surface override [Material] defined in this [MeshInstance3D], or the surface [Material] defined in the [member mesh]. For example, if [member GeometryInstance3D.material_override] is used, all surfaces will return the override material. Returns [code]null[/code] if no material is active, including when [member mesh] is [code]null[/code]. Returns the number of blend shapes available. Produces an error if [member mesh] is [code]null[/code]. Returns the value of the blend shape at the given [param blend_shape_idx]. Returns [code]0.0[/code] and produces an error if [member mesh] is [code]null[/code] or doesn't have a blend shape at that index. Returns the override [Material] for the specified [param surface] of the [Mesh] resource. Returns the number of surface override materials. This is equivalent to [method Mesh.get_surface_count]. Sets the value of the blend shape at [param blend_shape_idx] to [param value]. Produces an error if [member mesh] is [code]null[/code] or doesn't have a blend shape at that index. Sets the override [param material] for the specified [param surface] of the [Mesh] resource. This material is associated with this [MeshInstance3D] rather than with [member mesh]. The [Mesh] resource for the instance. [NodePath] to the [Skeleton3D] associated with the instance. The [Skin] to be used by this instance.