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<structure> <realm>Shared</realm> <description>Table structure representing a mesh vertex used by various functions, such as <page>IMesh:BuildFromTriangles</page> and <page>Entity:PhysicsFromMesh</page> and returned by functions such as <page>util.GetModelMeshes</page> and <page>PhysObj:GetMesh</page>.</description>⤶ <description>⤶ A <page>table</page> structure representing the data stored by a single vertex of a mesh.⤶ ⤶ MeshVertex structures are usually grouped together in sets of 3 to define the corners of a triangle.⤶ ⤶ <note>⤶ Not all MeshVertex will contain all fields and not all fields are used by all shaders⤶ ⤶ Information on the fields used by most Source Engine shaders (Like `VertexLitGeneric`, `UnlitGeneric`, etc.) can be found [on the Valve Developer Wiki here.](https://developer.valvesoftware.com/wiki/Category:Shaders)⤶ </note>⤶ ⤶ Returned by:⤶ * <page>util.GetModelMeshes</page>⤶ * <page>PhysObj:GetMesh</page>⤶ ⤶ Used by:⤶ * <page>IMesh:BuildFromTriangles</page>⤶ * <page>Entity:PhysicsFromMesh</page>⤶ </description>⤶ <fields> <item name="color" type="table">The vertex color. Uses the <page>Color</page>.</item>⤶ <item name="normal" type="Vector">The triangles normal required to calculate lighting (Optional).</item>⤶ <item name="tangent" type="Vector">The triangles tangent. Not used by the `VertexLitGeneric` shader.</item> <item name="binormal" type="Vector">The triangles binormal. Not used by the `VertexLitGeneric` shader.</item>⤶ <item name="pos" type="Vector">The vertex position.</item>⤶ <item name="u" type="number">The U texture coordinate.</item>⤶ <item name="v" type="number">The V texture coordinate.</item> <item name="u1" type="number" added="2024.02.28">The secondary U texture coordinate. Only works when passed to <page>IMesh:BuildFromTriangles</page>, Useful for `LightmappedGeneric` shader.</item>⤶ <item name="v1" type="number" added="2024.02.28">The secondary V texture coordinate. Only works when passed to <page>IMesh:BuildFromTriangles</page>.</item>⤶ <item name="userdata" type="table">A table of four numbers. This is used by most shaders in Source to hold tangent information of the vertex ( tangentX, tangentY, tangentZ, tangentHandedness ).</item> <item name="color" type="Color">⤶ The <page>Color</page> that the area around this corner of a triangle should be tinted.⤶ </item> <item name="normal" type="Vector">⤶ A normalized <page>Vector</page> representing a direction facing away from (perpendicular to) the surface of the triangle that this vertex is a part of.⤶ ⤶ Many shaders use this to calculate lighting.⤶ </item> <item name="tangent" type="Vector">⤶ A normalized <page>Vector</page> representing a direction facing along (parallel with) the surface of the triangle that this vertex is a part of.⤶ </item> <item name="binormal" type="Vector">⤶ A normalized <page>Vector</page> representing a direction facing away from (perpendicular to) both the vertex's normal and tangent directions.⤶ ⤶ This is the result of a <page text="Cross Product">Vector:Cross</page> between the vertex's normal and tangent directions.⤶ </item>⤶ <item name="pos" type="Vector">⤶ The position of the vertex in local space.⤶ </item>⤶ <item name="u" type="number">⤶ The horizontal coordinate of a position on the texture of the triangle that this vertex is a part of.⤶ This controls which part of the texture is drawn at this vertex.⤶ ⤶ In the range `0` (the texture's left edge) to `1` (the texture's right edge)⤶ </item>⤶ <item name="v" type="number">⤶ The vertical coordinate of a position on the texture of the triangle that this vertex is a part of.⤶ This controls which part of the texture is drawn at this vertex.⤶ ⤶ In the range `0` (the texture's top edge) to `1` (the texture's bottom edge)⤶ </item>⤶ <item name="u1" type="number" added="2024.02.28">⤶ A secondary U texture coordinate used by some shaders like `LightmappedGeneric`.⤶ ⤶ Currently used exclusively by <page>IMesh:BuildFromTriangles</page>.⤶ </item>⤶ <item name="v1" type="number" added="2024.02.28">⤶ A secondary V texture coordinate used by some shaders like `LightmappedGeneric`.⤶ ⤶ Currently used exclusively by <page>IMesh:BuildFromTriangles</page>.⤶ </item>⤶ <item name="userdata" type="table">⤶ A table of four numbers whose purpose and expected values are determined by the shader.⤶ ⤶ Many Source Engine shaders to hold tangent information of the vertex in the order `tangentX`, `tangentY`, `tangentZ`, `tangentHandedness`.⤶ </item>⤶ </fields> ⤶ </structure>⤶ ⤶ </structure>

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