Plug-in mouse tools (fry.tool{name, help, click(at, normal, object)}): listed in the Toolbox, a click in the view calls it (one undo); Stamp comes as an example; the Plug-ins window: look for one, make your own copy of one that comes with Fry3DX

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

content/Fry3DX/plugins/stamp.lua

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+-- Stamp: a mouse tool. Click on anything (or the ground) and a copy of the picked object is put
+-- there, standing on the surface. Shows how a plug-in adds a tool to the Toolbox (fry.tool).
+fry.plugin{name = "Stamp", about = "A tool: click to put copies of the picked object on what you click, standing on it."}
+
+fry.tool{
+  name = "Stamp copies",
+  help = "Click to put a copy of the picked object there, standing on the surface (pick one first).",
+  click = function(at, normal, onto)
+    local picked = fry.selected()
+    local o = picked[#picked]
+    if not o or (onto and o.id == onto.id) then
+      -- nothing picked to copy (or clicking on it): a little ball, to show where
+      o = fry.add("sphere", {radius = 0.1})
+      o.position = at + normal * 0.1
+      return
+    end
+    local c = o:copy()
+    local lo, hi = o:bounds()
+    c.position = at + normal * ((hi.z - lo.z) / 2)
+    o:select()
+  end,
+}