fix six possible "divide by zero"

scene/3d/navigation.cpp

@@ -64,7 +64,11 @@ void Navigation::_navmesh_link(int p_id) {
 			continue;
 		}
 
-		p.center=center/plen;
+		p.center = center;
+		if( plen != 0 ) {
+			p.center /= plen;
+		}
+
 
 		//connect
 
@@ -721,5 +725,3 @@ Navigation::Navigation() {
 	last_id=1;
 	up=Vector3(0,1,0);
 }
-
-

scene/gui/color_picker.cpp

@@ -361,7 +361,10 @@ void ColorPicker::_preset_input(const InputEvent &ev) {
 		emit_signal("color_changed", color);
 	} else if (ev.type == InputEvent::MOUSE_MOTION) {
 		const InputEventMouse &mev = ev.mouse_motion;
-		int index = mev.x/(preset->get_size().x/presets.size());
+		int index = mev.x * presets.size();
+		if( preset->get_size().x != 0 ) {
+			index /= preset->get_size().x;
+		}
 		if (index<0 || index >= presets.size())
 			return;
 		preset->set_tooltip("Color: #"+presets[index].to_html(presets[index].a<1)+"\n"
@@ -684,4 +687,3 @@ ColorPickerButton::ColorPickerButton() {
 	picker->connect("color_changed",this,"_color_changed");
 	add_child(popup);
 }
-

servers/visual/visual_server_raster.cpp

@@ -5667,7 +5667,10 @@ void VisualServerRaster::_instance_validate_autorooms(Instance *p_geometry) {
 
 		int pass = room->room_info->room->bounds.get_points_inside(dst_points,point_count);
 
-		float ratio = (float)pass / point_count;
+		float ratio = pass;
+		if( point_count != 0 ) {
+			ratio /= (float)point_count;
+		}
 
 		if (ratio>0.5) // should make some constant
 			p_geometry->valid_auto_rooms.insert(room);
@@ -7670,5 +7673,3 @@ VisualServerRaster::VisualServerRaster(Rasterizer *p_rasterizer) {
 VisualServerRaster::~VisualServerRaster()
 {
 }
-
-

tools/editor/plugins/editor_preview_plugins.cpp

@@ -725,7 +725,11 @@ Ref<Texture> EditorSamplePreviewPlugin::generate(const RES& p_from) {
 					} else {
 						half=1;
 						ofs=h/2;
-						v = ((j-(h/2))/(float)(h/2)) * 2.0 - 1.0;
+						if( (float)(h/2) != 0 ) {
+							v = ((j-(h/2))/(float)(h/2)) * 2.0 - 1.0;
+						} else {
+							v = ((j-(h/2))/(float)(1/2)) * 2.0 - 1.0;
+						}
 					}
 
 					uint8_t* imgofs = &imgw[(j*w+i)*3];

tools/editor/plugins/script_editor_plugin.cpp

@@ -1784,7 +1784,8 @@ void ScriptEditor::_update_script_colors() {
 		if (h>hist_size) {
 			continue;
 		}
-		float v = Math::ease((edit_pass-pass)/float(hist_size),0.4);
+		int non_zero_hist_size = ( hist_size == 0 ) ? 1 : hist_size;
+		float v = Math::ease((edit_pass-pass)/float(non_zero_hist_size),0.4);
 
 
 		script_list->set_item_custom_bg_color(i,hot_color.linear_interpolate(cold_color,v));
@@ -2704,4 +2705,3 @@ ScriptEditorPlugin::ScriptEditorPlugin(EditorNode *p_node) {
 ScriptEditorPlugin::~ScriptEditorPlugin()
 {
 }
-

tools/editor/plugins/spatial_editor_plugin.cpp

@@ -2084,7 +2084,9 @@ void SpatialEditorViewport::_menu_option(int p_option) {
 				count++;
 			}
 
-			center/=float(count);
+			if( count != 0 ) {
+				center/=float(count);
+			}
 
 			cursor.pos=center;
 		} break;
@@ -4240,6 +4242,3 @@ SpatialEditorPlugin::SpatialEditorPlugin(EditorNode *p_node) {
 SpatialEditorPlugin::~SpatialEditorPlugin() {
 
 }
-
-
-