The [SurfaceTool] is used to construct a [Mesh] by specifying vertex attributes individually. It can be used to construct a [Mesh] from a script. All properties except indices need to be added before calling [method add_vertex]. For example, to add vertex colors and UVs:
The above [SurfaceTool] now contains one vertex of a triangle which has a UV coordinate and a specified [Color]. If another vertex were added without calling [method set_uv] or [method set_color], then the last values would be used.
Vertex attributes must be passed [b]before[/b] calling [method add_vertex]. Failure to do so will result in an error when committing the vertex information to a mesh.
Additionally, the attributes used before the first vertex is added determine the format of the mesh. For example, if you only add UVs to the first vertex, you cannot add color to any of the subsequent vertices.
[b]Note:[/b] Godot uses clockwise [url=https://learnopengl.com/Advanced-OpenGL/Face-culling]winding order[/url] for front faces of triangle primitive modes.
Returns a constructed [ArrayMesh] from current information passed in. If an existing [ArrayMesh] is passed in as an argument, will add an extra surface to the existing [ArrayMesh].
The [param flags] argument can be the bitwise OR of [constant Mesh.ARRAY_FLAG_USE_DYNAMIC_UPDATE], [constant Mesh.ARRAY_FLAG_USE_8_BONE_WEIGHTS], or [constant Mesh.ARRAY_FLAG_USES_EMPTY_VERTEX_ARRAY].
Commits the data to the same format used by [method ArrayMesh.add_surface_from_arrays], [method ImporterMesh.add_surface], and [method create_from_arrays]. This way you can further process the mesh data using the [ArrayMesh] or [ImporterMesh] APIs.
Creates this SurfaceTool from existing vertex arrays such as returned by [method commit_to_arrays], [method Mesh.surface_get_arrays], [method Mesh.surface_get_blend_shape_arrays], [method ImporterMesh.get_surface_arrays], and [method ImporterMesh.get_surface_blend_shape_arrays]. [param primitive_type] controls the type of mesh data, defaulting to [constant Mesh.PRIMITIVE_TRIANGLES].
<methodname="generate_lod"deprecated="This method is unused internally, as it does not preserve normals or UVs. Consider using [method ImporterMesh.generate_lods] instead.">
Generates an LOD for a given [param nd_threshold] in linear units (square root of quadric error metric), using at most [param target_index_count] indices.
Generates normals from vertices so you do not have to do it manually. If [param flip] is [code]true[/code], the resulting normals will be inverted. [method generate_normals] should be called [i]after[/i] generating geometry and [i]before[/i] committing the mesh using [method commit] or [method commit_to_arrays]. For correct display of normal-mapped surfaces, you will also have to generate tangents using [method generate_tangents].
[b]Note:[/b] [method generate_normals] takes smooth groups into account. To generate smooth normals, set the smooth group to a value greater than or equal to [code]0[/code] using [method set_smooth_group] or leave the smooth group at the default of [code]0[/code]. To generate flat normals, set the smooth group to [code]-1[/code] using [method set_smooth_group] prior to adding vertices.
Specifies a [Color] to use for the [i]next[/i] vertex. If every vertex needs to have this information set and you fail to submit it for the first vertex, this information may not be used at all.
Specifies a normal to use for the [i]next[/i] vertex. If every vertex needs to have this information set and you fail to submit it for the first vertex, this information may not be used at all.
Specifies the smooth group to use for the [i]next[/i] vertex. If this is never called, all vertices will have the default smooth group of [code]0[/code] and will be smoothed with adjacent vertices of the same group. To produce a mesh with flat normals, set the smooth group to [code]-1[/code].
[b]Note:[/b] This function actually takes a [code]uint32_t[/code], so C# users should use [code]uint32.MaxValue[/code] instead of [code]-1[/code] to produce a mesh with flat normals.
Specifies a tangent to use for the [i]next[/i] vertex. If every vertex needs to have this information set and you fail to submit it for the first vertex, this information may not be used at all.
Specifies a set of UV coordinates to use for the [i]next[/i] vertex. If every vertex needs to have this information set and you fail to submit it for the first vertex, this information may not be used at all.
Specifies an optional second set of UV coordinates to use for the [i]next[/i] vertex. If every vertex needs to have this information set and you fail to submit it for the first vertex, this information may not be used at all.
Specifies weight values to use for the [i]next[/i] vertex. [param weights] must contain 4 values. If every vertex needs to have this information set and you fail to submit it for the first vertex, this information may not be used at all.
Limits range of data passed to [method set_custom] to unsigned normalized 0 to 1 stored in 8 bits per channel. See [constant Mesh.ARRAY_CUSTOM_RGBA8_UNORM].
Limits range of data passed to [method set_custom] to signed normalized -1 to 1 stored in 8 bits per channel. See [constant Mesh.ARRAY_CUSTOM_RGBA8_SNORM].
Stores data passed to [method set_custom] as half precision floats, and uses only red and green color channels. See [constant Mesh.ARRAY_CUSTOM_RG_HALF].
Stores data passed to [method set_custom] as full precision floats, and uses only red and green color channels. See [constant Mesh.ARRAY_CUSTOM_RG_FLOAT].
Stores data passed to [method set_custom] as full precision floats, and uses only red, green and blue color channels. See [constant Mesh.ARRAY_CUSTOM_RGB_FLOAT].
