info_overlay - allows to create any type of decal on the surface of a brush, stretch them and turn them.(created using the "Apply overlay" tool by clicking on a surface of an entity on the 3d Camera window)
Properties:
Material - the same as infodecal, a material to use is specified here. Note: Best to use materials from the decals folder
Brush Faces - specifies on which side of the brush the overlay is located. Each side has it's own number. If we judge the side from the top view an the brush is a rectangle, that means:
1- topside(parallel to the view), 2- bottomside(parallel), 3- left side, 4- right side, 5- upper side(perpendicular to the view), 6- backside(perpendicular)
U start; U end; V start; V End - used for setting up the size of the material. Basically, in the part selected the size of the texture(warning: not the overlay material, but the material itself[relative to scale])
Last parameters are changed the following way(taking into the account we have already created an overlay): With LMB select the entity info_overlay in the map. Select the instrument
apply overlays, around the corners ther will be white squares - they are markers, now you can move them around how you like because the material will be stretched. Markers depend on the current grid setting. Using overlays you can create the effect of stretched blood(like someone was dragging someone on the floor

).
Flags - none
By the way, this entity is placed into the map, so forget about enabling/disabling it.