Default value
null
Possible values
Any non-empty text string
If any icon uses render_target, and another icon in the scene has a matching render_source, this icon will be drawn to a temporary image called a “slate”, which can be reused mutiple times for faster drawing and for special effects.
If the render_target value starts with an asterisk ("*"), it will not be drawn on the map, but will still be drawn to a slate for reuse.
Other vars that would normally affect the appearance of this icon, such as color, transform, filters, appearance_flags, etc. are all applied when drawing to the slate. Additionally, if this object has overlays, underlays, or visual contents and uses the KEEP_TOGETHER flag to group all of the icons together, those will also be included in the slate.
If the render target is a PLANE_MASTER, vars like pixel_x/y/w/z will not apply when it is re-drawn as a render_source.
To use a render_target, the object it belongs to must be within the visible part of the map, or in the HUD, etc., so that it would be visible to the user under normal circumstances. If not, it will not be included in the render process and therefore it can’t be reused as a render_source.
Additionally, if you use multiple map controls, a given render target can only be used as a source on the same map control where it appears. This is because each map is rendered separately.