Point clouds: drawn from their scans, placed, cropped and attached as the reference does

Scans (.rcs) and projects (.rcp) are read and their points drawn as
screen-sized dots, coloured by the cloud's stylization. The cloud's
placement carries its scale and rotation; its extents and crops stay in
the scan's coordinates. A missing scan shows the extents with the saved
path. -POINTCLOUDATTACH / POINTCLOUDATTACH, POINTCLOUDCROP and the
POINTCLOUD* settings follow the reference's prompts and messages, the
Properties list is the reference's, and a locked cloud is left alone by
edits.

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

src/app/commands/styleprops.rs

@@ -1031,6 +1031,21 @@ impl OpenCADStudio {
                     | "PDFIMPORTIMAGEPATH"
                     | "XDWGFADECTL"
                     | "POINTCLOUDCLIPFRAME"
+                    | "POINTCLOUDDENSITY"
+                    | "POINTCLOUDPOINTSIZE"
+                    | "POINTCLOUDLOCK"
+                    | "POINTCLOUDAUTOUPDATE"
+                    | "POINTCLOUDBOUNDARY"
+                    | "POINTCLOUDRTDENSITY"
+                    | "POINTCLOUDLOD"
+                    | "POINTCLOUDPOINTMAX"
+                    | "POINTCLOUDVISRETAIN"
+                    | "POINTCLOUDSHADING"
+                    | "POINTCLOUDCACHESIZE"
+                    | "POINTCLOUD2DVSDISPLAY"
+                    | "POINTCLOUDLIGHTING"
+                    | "POINTCLOUDLIGHTSOURCE"
+                    | "POINTCLOUDPOINTMAXLEGACY"
                     | "XCLIPFRAME"
                     | "WIPEOUTFRAME"
                     | "HALOGAP"
@@ -1096,6 +1111,39 @@ impl OpenCADStudio {
                         crate::t!("SETVAR: CETRANSPARENCY LTSCALE CELTSCALE PDMODE PDSIZE TEXTSIZE ORTHOMODE FILLMODE MIRRTEXT FRAME IMAGEFRAME PDFFRAME WIPEOUTFRAME XCLIPFRAME POINTCLOUDCLIPFRAME ZOOMWHEEL ZOOMFACTOR SHORTCUTMENU SHORTCUTMENUDURATION CURSORSIZE PICKBOX CURSORTYPE SNAPANG TEXTFILL CLIPROMPTLINES COMMANDLINEFADETIME ATTREQ ATTDIA DIMASSOC DIMCONTINUEMODE CONSTRAINTSOLVEMODE CONSTRAINTINFER CONSTRAINTBARDISPLAY CONSTRAINTBARMODE CONSTRAINTNAMEFORMAT DYNCONSTRAINTDISPLAY ANGBASE ANGDIR SKETCHINC SKPOLY SKTOLERANCE DONUTID DONUTOD CENTEREXE CENTERLAYER CENTERLTYPE CENTERLTSCALE CENTERLTYPEFILE CENTERCROSSSIZE CENTERCROSSGAP CENTERMARKEXE COLORTHEME SELECTIONAREA SELECTIONAREAOPACITY SELECTIONEFFECT SELECTIONEFFECTCOLOR WINDOWSAREACOLOR CROSSINGAREACOLOR SELECTIONPREVIEW GRIPSIZE GRIPCOLOR GRIPHOT GRIPHOVER GRIPOBJLIMIT | CLAYER CELTYPE TEXTSTYLE (read-only)").as_ref(),
                     );
                 } else {
+                    // Point cloud settings, kept with the drawing.
+                    if let Some(setting) = crate::scene::model::point_cloud::setting(&name) {
+                        let document = &self.tabs[i].scene.document;
+                        let current = crate::scene::model::point_cloud::setting_value(document, setting);
+                        match value.as_deref().map(|value| setting.check(value)) {
+                            Some(Ok(new)) => {
+                                if new != current {
+                                    crate::io::set_drawing_variable(
+                                        &mut self.tabs[i].scene.document,
+                                        setting.name,
+                                        &new.to_string(),
+                                    );
+                                    self.tabs[i].scene.bump_geometry();
+                                    self.tabs[i].dirty = true;
+                                }
+                            }
+                            // Refused: say why, and ask again unless the value ends it.
+                            Some(Err(refusal)) => {
+                                for line in &refusal.lines {
+                                    self.command_line.push_error(line);
+                                }
+                                if refusal.ask_again {
+                                    self.command_line.push_output(&format!("Enter new value for {name} <{current}>:"));
+                                    self.pending_setvar = Some(name.clone());
+                                }
+                            }
+                            None => {
+                                self.command_line.push_output(&format!("Enter new value for {name} <{current}>:"));
+                                self.pending_setvar = Some(name.clone());
+                            }
+                        }
+                        return Some(self.finish_dispatch(cmd));
+                    }
                     if name == "XDWGFADECTL" {
                         let current = crate::scene::cache::block_cache::xref_fade_ctl();
                         if let Some(value) = &value {