Improve the AudioStreamPlayer3D gizmo

This adds more lines to the emission angle cone to give a better
feel of depth in the 3D world.

editor/spatial_editor_gizmos.cpp

@@ -1074,7 +1074,8 @@ AudioStreamPlayer3DSpatialGizmoPlugin::AudioStreamPlayer3DSpatialGizmoPlugin() {
 	Color gizmo_color = EDITOR_DEF("editors/3d_gizmos/gizmo_colors/stream_player_3d", Color(0.4, 0.8, 1));
 
 	create_icon_material("stream_player_3d_icon", SpatialEditor::get_singleton()->get_icon("GizmoSpatialSamplePlayer", "EditorIcons"));
-	create_material("stream_player_3d_material", gizmo_color);
+	create_material("stream_player_3d_material_primary", gizmo_color);
+	create_material("stream_player_3d_material_secondary", gizmo_color * Color(1, 1, 1, 0.35));
 	create_handle_material("handles");
 }
 
@@ -1160,50 +1161,53 @@ void AudioStreamPlayer3DSpatialGizmoPlugin::commit_handle(EditorSpatialGizmo *p_
 
 void AudioStreamPlayer3DSpatialGizmoPlugin::redraw(EditorSpatialGizmo *p_gizmo) {
 
-	AudioStreamPlayer3D *player = Object::cast_to<AudioStreamPlayer3D>(p_gizmo->get_spatial_node());
+	const AudioStreamPlayer3D *player = Object::cast_to<AudioStreamPlayer3D>(p_gizmo->get_spatial_node());
 
 	p_gizmo->clear();
 
-	Ref<Material> icon = get_material("stream_player_3d_icon", p_gizmo);
+	const Ref<Material> icon = get_material("stream_player_3d_icon", p_gizmo);
 
 	if (player->is_emission_angle_enabled()) {
 
-		Ref<Material> material = get_material("stream_player_3d_material", p_gizmo);
-
-		float pc = player->get_emission_angle();
-
-		Vector<Vector3> points;
-		points.resize(208);
+		const float pc = player->get_emission_angle();
+		const float ofs = -Math::cos(Math::deg2rad(pc));
+		const float radius = Math::sin(Math::deg2rad(pc));
 
-		float ofs = -Math::cos(Math::deg2rad(pc));
-		float radius = Math::sin(Math::deg2rad(pc));
+		Vector<Vector3> points_primary;
+		points_primary.resize(200);
 
 		for (int i = 0; i < 100; i++) {
 
-			float a = i * 2.0 * Math_PI / 100.0;
-			float an = (i + 1) * 2.0 * Math_PI / 100.0;
+			const float a = i * 2.0 * Math_PI / 100.0;
+			const float an = (i + 1) * 2.0 * Math_PI / 100.0;
 
-			Vector3 from(Math::sin(a) * radius, Math::cos(a) * radius, ofs);
-			Vector3 to(Math::sin(an) * radius, Math::cos(an) * radius, ofs);
+			const Vector3 from(Math::sin(a) * radius, Math::cos(a) * radius, ofs);
+			const Vector3 to(Math::sin(an) * radius, Math::cos(an) * radius, ofs);
 
-			points.write[i * 2 + 0] = from;
-			points.write[i * 2 + 1] = to;
+			points_primary.write[i * 2 + 0] = from;
+			points_primary.write[i * 2 + 1] = to;
 		}
 
-		for (int i = 0; i < 4; i++) {
+		const Ref<Material> material_primary = get_material("stream_player_3d_material_primary", p_gizmo);
+		p_gizmo->add_lines(points_primary, material_primary);
+
+		Vector<Vector3> points_secondary;
+		points_secondary.resize(16);
 
-			float a = i * 2.0 * Math_PI / 4.0;
+		for (int i = 0; i < 8; i++) {
 
-			Vector3 from(Math::sin(a) * radius, Math::cos(a) * radius, ofs);
+			const float a = i * 2.0 * Math_PI / 8.0;
+			const Vector3 from(Math::sin(a) * radius, Math::cos(a) * radius, ofs);
 
-			points.write[200 + i * 2 + 0] = from;
-			points.write[200 + i * 2 + 1] = Vector3();
+			points_secondary.write[i * 2 + 0] = from;
+			points_secondary.write[i * 2 + 1] = Vector3();
 		}
 
-		p_gizmo->add_lines(points, material);
+		const Ref<Material> material_secondary = get_material("stream_player_3d_material_secondary", p_gizmo);
+		p_gizmo->add_lines(points_secondary, material_secondary);
 
 		Vector<Vector3> handles;
-		float ha = Math::deg2rad(player->get_emission_angle());
+		const float ha = Math::deg2rad(player->get_emission_angle());
 		handles.push_back(Vector3(Math::sin(ha), 0, -Math::cos(ha)));
 		p_gizmo->add_handles(handles, get_material("handles"));
 	}