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rendertarget_attach(3) Arcan Lua API rendertarget_attach(3) NAME rendertarget_attach - Modify the attachment statement of a video object SYNOPSIS nil rendertarget_attach( rendertarget, source, detach_state ) DESCRIPTION Every video object has at least one (primary), but possibly many (sec- ondary) connections to different rendertargets. The primary connection also defines lifespan, meaning that if the object which act as a primary connec- tion is deleted, so are any other objects that are attached to it. This as- sociation can be changed either when creating new rendertargets or dynami- cally using this function. rendertarget specifies the attachment point, source refers to the object that should be attached or detached and detach_state determines if the primary attachment should be reassigned ( RENDERTARGET_DETACH ) or kept ( RENDERTARGET_NODETACH ). Only WORLDID or a vid that has been previously flagged as a rendertarget (using define_rendertarget or define_calctarget or define_recordtarget ) are valid values for rendertraget . NOTES 1 Relative properties (scale, position etc.) are all defined against the current primary rendertarget and are not recalculated on at- tach/detach operations. The common pattern to handle objects that should have the same storage but live inside different rendertargets is to use null_surface to create a new container, image_sharestor- age to make sure source and new object has the same backing store and then finally rendertarget_attach the new object with RENDERTARGET_DETACH . 2 3 Deleting an object also implies detaching it from all rendertargets. 4 A rendertarget cannot be attached to itself. 5 Objects that have been flagged as persistant cannot be part of other rendertargets. EXAMPLE function rendertarget_attach0() local rtgt = alloc_surface(VRESW, VRESH); resize_image(rtgt, 200, 200); local obj_a = color_surface(32, 32, 0, 255, 0); show_image({rtgt, obj_a}); define_rendertarget(rtgt, {obj_a}); local new_obj = color_surface(64, 64, 255, 0, 0); show_image(new_obj); move_image(new_obj, VRESW * 0.5, VRESH * 0.5); rendertarget_attach(rtgt, new_obj, RENDERTARGET_NODETACH); end SEE ALSO: define_rendertarget(3) define_recordtarget(3) define_calctarget(3) targetcontrol August 2026 rendertarget_attach(3)
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