Merge pull request #8801 from julien-moreau/master

Added support of delay loading for LODs

src/Meshes/mesh.ts

@@ -765,6 +765,15 @@ export class Mesh extends AbstractMesh implements IGetSetVerticesData {
 
             if (level.distance < distanceToCamera) {
                 if (level.mesh) {
+                    if (level.mesh.delayLoadState === Constants.DELAYLOADSTATE_NOTLOADED) {
+                        level.mesh._checkDelayState();
+                        return this;
+                    }
+
+                    if (level.mesh.delayLoadState === Constants.DELAYLOADSTATE_LOADING) {
+                        return this;
+                    }
+
                     level.mesh._preActivate();
                     level.mesh._updateSubMeshesBoundingInfo(this.worldMatrixFromCache);
                 }
@@ -3106,6 +3115,8 @@ export class Mesh extends AbstractMesh implements IGetSetVerticesData {
             var serializationInstance: any = {
                 name: instance.name,
                 id: instance.id,
+                isEnabled: instance.isEnabled(false),
+                isVisible: instance.isVisible,
                 isPickable: instance.isPickable,
                 checkCollisions: instance.checkCollisions,
                 position: instance.position.asArray(),
@@ -3515,6 +3526,14 @@ export class Mesh extends AbstractMesh implements IGetSetVerticesData {
                     instance._waitingParentId = parsedInstance.parentId;
                 }
 
+                if (parsedInstance.isEnabled !== undefined && parsedInstance.isEnabled !== null) {
+                    instance.setEnabled(parsedInstance.isEnabled);
+                }
+
+                if (parsedInstance.isVisible !== undefined && parsedInstance.isVisible !== null) {
+                    instance.isVisible = parsedInstance.isVisible;
+                }
+
                 if (parsedInstance.isPickable !== undefined && parsedInstance.isPickable !== null) {
                     instance.isPickable = parsedInstance.isPickable;
                 }