From 3d476186f53d695c340c51dbd3aa14ff4621c520 Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Sun, 16 Aug 2026 23:52:34 -0700
Subject: trivial placement

---
 src/renderer/mod.rs | 19 ++++++++++---------
 src/renderer/ui.rs  | 31 ++++++++++++++++++++++++++++++-
 2 files changed, 40 insertions(+), 10 deletions(-)

(limited to 'src/renderer')

diff --git a/src/renderer/mod.rs b/src/renderer/mod.rs
index 39a507b..3076894 100644
--- a/src/renderer/mod.rs
+++ b/src/renderer/mod.rs
@@ -492,15 +492,16 @@ impl RendererState {
             }
 
             for (id, slot) in &self.renderer_rb_entities {
-                let (x, y, cos, sin) = rb_sim_manager.get_rb_entity_transform(*id).unwrap();
-                instances.push(Instance {
-                    centre: [x, y],
-                    cos_sin: [cos, sin],
-                    half_size,
-                    dims,
-                    cell_offset: (slot * CELLS_IN_CHUNK) as u32,
-                    _padding: 0,
-                });
+                if let Some((x, y, cos, sin)) = rb_sim_manager.get_rb_entity_transform(*id) {
+                    instances.push(Instance {
+                        centre: [x, y],
+                        cos_sin: [cos, sin],
+                        half_size,
+                        dims,
+                        cell_offset: (slot * CELLS_IN_CHUNK) as u32,
+                        _padding: 0,
+                    });
+                }
             }
 
             self.queue
diff --git a/src/renderer/ui.rs b/src/renderer/ui.rs
index 77af59d..590c720 100644
--- a/src/renderer/ui.rs
+++ b/src/renderer/ui.rs
@@ -20,7 +20,7 @@ pub fn draw_egui<'a>(
     let material = config.brush_material.def();
 
     // material combobox
-    egui::ComboBox::from_label("Select a material")
+    egui::ComboBox::from_label("Select a brush material")
         .selected_text(format!(
             "Material: [{}, d={}]",
             material.name, material.density,
@@ -43,6 +43,35 @@ pub fn draw_egui<'a>(
             }
         });
 
+    let dropper_material = config.brush_material.def();
+
+    egui::ComboBox::from_label("Select a dropper material")
+        .selected_text(format!(
+            "Material: [{}, d={}]",
+            dropper_material.name, dropper_material.density,
+        ))
+        .icon(move |ui, rect, _, _| {
+            ui.painter().add(egui::Shape::Circle(CircleShape {
+                center: rect.center(),
+                radius: rect.height() / 2.0,
+                stroke: Stroke::NONE,
+                fill: Color32::from_rgb(
+                    dropper_material.color.0,
+                    dropper_material.color.1,
+                    dropper_material.color.2,
+                ),
+            }));
+        })
+        .show_ui(ui, |ui| {
+            for material_id in MaterialId::ALL {
+                ui.selectable_value(
+                    &mut config.dropper_material,
+                    material_id,
+                    material_id.def().name,
+                );
+            }
+        });
+
     ui.checkbox(&mut config.use_threading, "Use multithreading");
     ui.label(format!("Real FPS: {}", diagnostics.fps));
     ui.heading("Camera");
-- 
cgit v1.3.1