DMX/Source 2 Vertex attributes

The DMX mesh format (Version 22) supports arbitrary mesh attributes. The Source 2 tools can make use of many attributes besides the standard ones to control per-vertex model features.

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Note: The list is very likely incomplete.

Standard

Attribute	Type	Description
position	vector3	Vertex position.
normal	vector3	Vertex normal.
texcoord	vector2	UV coordinates. A second UV map can be added with texcoord$1.
blendweights	float
blendindices	int
wrinkle
balance	float
tangent	vector4
speed

Vertex Color Maps

Attribute	Type	Description
color	vector4	Vertex color. Can be used in the VR shaders to tint a model with the appropriate material attribute enabled.
VertexPaintBlendParams	vector4	Used to blend between texture layers in bland materials. Works the same way as the Hammer Terrain Blending tool.
VertexPaintBlendParams1	vector4	Todo:  Unknown additional blend parameters
VertexPaintTintColor	vector4

Cloth Simulation

Attribute	Type	Description
cloth_enable	float	(0 - 1) Enables cloth simulation and creates a cloth node on the vertex when set to 1.
cloth_animation_attract	float	Legacy parameter deprecated in favor of cloth_goal_strength.
cloth_animation_force_attract	float	Legacy parameter deprecated in favor of cloth_goal_strength.
cloth_goal_strength	float	(0 - 1) Controls the how much animations influence the vertex position.
cloth_goal_strength_v2	float	(0 - 1) Todo: Same as cloth_goal_strength?
cloth_goal_damping	float
cloth_drag	float
cloth_drag_v2	float
cloth_mass	float	Todo: This sets the per-vertex mass in kg, but doesn't seem to go below 1, leading to extremely massive cloth. Enabling explicit masses ignores this value, contrary to documentation
cloth_gravity	float
cloth_gravity_z	float
cloth_collision_radius	float
cloth_ground_collision	float
cloth_ground_friction	float
cloth_use_rods	float
cloth_make_rods	float
cloth_anchor_free_rotate	float	(0 - 1) Controls how freely cloth nodes bordering to non-cloth vertices can rotate.
cloth_volumetric	float
cloth_suspenders	float
cloth_bend_stiffness	float	(0 - 1) Controls curvature of bend springs. Requires m_bAddStiffnessRods to be enabled.
cloth_stray_radius_inv	float
cloth_stray_radius	float
cloth_stray_radius_stretchiness	float
cloth_antishrink	float
cloth_shear_resistance	float
cloth_stretch	float	(0..+inf) A value of 1 gives extremely loose cloth. Strechiness increases exponentially with value. Todo: Does this affect both quads and rods?
cloth_friction	float
cloth_collision_layer_0 - 15	float
cloth_vertex_set_<set_name>	float