create BillboardSceneNode, but isn't final design.

CMCore

@@ -1 +1 @@
-Subproject commit 1bc9a625da6689e95a106e838b81dd82e2eb69e8
+Subproject commit cc4183ca55158efa3e4321cc3dbfbd3703eca1d6

CMSceneGraph

@@ -1 +1 @@
-Subproject commit d79ee130efcc4e4df9a5e0185e41908639490fe4
+Subproject commit 079becd267447676ced6678bd8406208d73169ee

example/Gizmo/Gizmo3DRotate.cpp

@@ -42,7 +42,7 @@ bool InitGizmoRotateStaticMesh()
         {
             Transform tm;
 
-            tm.SetScale(10.0f);
+            tm.SetScale(5.0f);
 
             root_node->CreateSubNode(tm,torus[0]);
 

example/Gizmo/GizmoTest.cpp

@@ -8,21 +8,56 @@ using namespace hgl::graph;
 const Vector3f GizmoPosition(0,0,0);
 
 /**
-* 求一个世界坐标在屏幕上的位置
+* 一种永远转向正面的场景节点
 */
-Vector2f WorldToScreen(const Vector3f &world_pos,const CameraInfo &ci,const ViewportInfo &vi)
+class BillboardSceneNode:public SceneNode
 {
-    Vector4f pos=ci.vp*Vector4f(world_pos,1);
+    CameraInfo *camera_info=nullptr;
+    bool face_to_camera=false;
 
-    pos/=pos.w;
+    ViewportInfo *viewport_info=nullptr;
+    float fixed_scale=1.0;
 
-    return Vector2f((pos.x+1)*vi.GetViewportWidth()/2,(1-pos.y)*vi.GetViewportHeight()/2);
+public:
-}
+
+    using SceneNode::SceneNode;
+    virtual ~BillboardSceneNode()=default;
+
+    virtual void SetCameraInfo  (CameraInfo *   ci  ){camera_info   =ci;}
+    virtual void SetViewportInfo(ViewportInfo * vi  ){viewport_info =vi;}
+
+    virtual void SetFaceToCamera(bool           ftc ){face_to_camera=ftc;}
+    virtual void SetFixedScale  (const float    size){fixed_scale   =size;}
+
+    virtual bool RefreshTransform(const Transform &tf=IdentityTransform) override
+    {
+        if(!camera_info)
+        {
+            return SceneNode::RefreshTransform(tf);
+        }
+
+        if(face_to_camera)
+        {
+            LocalTransform.SetRotation(CalculateFacingRotationQuat(GetWorldPosition(),camera_info->view,AxisVector::X));
+        }
+
+        if(viewport_info)
+        {
+            const float screen_height=viewport_info->GetViewportHeight();
+
+            const Vector4f pos=camera_info->Project(GetWorldPosition());
+
+            LocalTransform.SetScale(pos.w*fixed_scale/screen_height);
+        }
+
+        return SceneNode::RefreshTransform(tf);
+    }
+};//class BillboardSceneNode:public SceneNode
 
 class TestApp:public SceneAppFramework
 {
     SceneNode root;
-    SceneNode *rotate_white_torus=nullptr;
+    BillboardSceneNode *rotate_white_torus=nullptr;
 
     StaticMesh *sm_move=nullptr;
     StaticMesh *sm_rotate=nullptr;
@@ -47,22 +82,33 @@ private:
     void InitGizmoSceneTree()
     {
         camera_control->Refresh();
-        const CameraInfo &ci=camera_control->GetCameraInfo();
+        CameraInfo *ci=camera_control->GetCameraInfo();
 
         root.Clear();
 
         root.CreateSubNode(sm_move->GetScene());
         root.CreateSubNode(sm_rotate->GetScene());
 
-        rotate_white_torus=root.CreateSubNode(face_torus);
+        {
+            Transform tm;
+
+            tm.SetScale(7.5);
+
+            rotate_white_torus=new BillboardSceneNode(tm,face_torus);
+
+            rotate_white_torus->SetCameraInfo(ci);
+            rotate_white_torus->SetFaceToCamera(true);
+
+            root.AddSubNode(rotate_white_torus);
+        }
 
         root.RefreshTransform();
-        render_list->SetCamera(&(camera_control->GetCameraInfo()));
+        render_list->SetCamera(ci);
         render_list->Expend(&root);
     }
 
 public:
-    
+
     bool Init(uint w,uint h)
     {        
         if(!SceneAppFramework::Init(w,h))
@@ -71,7 +117,7 @@ public:
         if(!InitGizmo())
             return(false);
 
-         InitGizmoSceneTree();
+        InitGizmoSceneTree();
         
         camera->pos=Vector3f(32,32,32);
         camera_control->SetTarget(Vector3f(0,0,0));
@@ -88,29 +134,20 @@ public:
     {
         camera_control->Refresh();
         
-        const CameraInfo &ci=camera_control->GetCameraInfo();
+        const CameraInfo *ci=camera_control->GetCameraInfo();
-        const ViewportInfo &vi=GetViewportInfo();
+        const ViewportInfo *vi=GetViewportInfo();
 
-        const float screen_height=vi.GetViewportHeight();
+        const float screen_height=vi->GetViewportHeight();
 
-        const Vector4f pos=ci.Project(GizmoPosition);
+        const Vector4f pos=ci->Project(GizmoPosition);
 
-        {
+        //{
-            Transform tm;
+        //    Transform tm;
 
-            tm.SetRotation(CalculateFacingRotationQuat(GizmoPosition,ci.view,AxisVector::X));
+        //    tm.SetScale(pos.w*16.0f/screen_height);
-            tm.SetScale(15);
 
-            rotate_white_torus->SetLocalTransform(tm);
+        //    root.SetLocalTransform(tm);
-        }
+        //}
-
-        {
-            Transform tm;
-
-            tm.SetScale(pos.w*16.0f/screen_height);
-
-            root.SetLocalTransform(tm);
-        }
 
         root.RefreshTransform();
         render_list->UpdateTransform();

example/Gizmo/RayPicking.cpp

@@ -55,7 +55,7 @@ private:
 
         cfg.local_to_world=true;
 
-        {            
+        {
             cfg.mtl_name="VertexLuminance2D";       //注意必须用不同名字，未来改名材质文件名+cfg hash名
             cfg.position_format=VAT_VEC2;
 
@@ -69,7 +69,7 @@ private:
             mi_plane_grid=db->CreateMaterialInstance(mtl_plane_grid,&vil_config,&white_color);
             if(!mi_plane_grid)return(false);
 
-            pipeline_plane_grid=CreatePipeline(mi_plane_grid,InlinePipeline::Solid3D,Prim::Lines);        
+            pipeline_plane_grid=CreatePipeline(mi_plane_grid,InlinePipeline::Solid3D,Prim::Lines);
             if(!pipeline_plane_grid)return(false);
         }
 
@@ -184,10 +184,10 @@ public:
 
     void BuildCommandBuffer(uint32 index) override
     {
-        const CameraInfo &ci=GetCameraInfo();
+        const CameraInfo *ci=GetCameraInfo();
-        const ViewportInfo &vi=GetViewportInfo();
+        const ViewportInfo *vi=GetViewportInfo();
 
-        ray.Set(GetMouseCoord(),&ci,&vi);                       //设置射线查询的屏幕坐标点
+        ray.Set(GetMouseCoord(),ci,vi);                       //设置射线查询的屏幕坐标点
 
         const Vector3f pos=ray.ClosestPoint(Vector3f(0,0,0));   //求射线上与点(0,0,0)最近的点的坐标
 

example/common/VulkanAppFramework.h

@@ -173,9 +173,9 @@ public:
         ubo_vp_info->Write(&vp_info);
     }
 
-    ViewportInfo &GetViewportInfo()
+    ViewportInfo *GetViewportInfo()
     {
-        return vp_info;
+        return &vp_info;
     }
 
     DeviceBuffer *GetViewportInfoBuffer()
@@ -532,9 +532,9 @@ public:
         win->Join(ckc);
         win->Join(cmc);
 
-        RefreshCameraInfo(&camera_control->GetCameraInfo(),&vp_info,camera);
+        RefreshCameraInfo(camera_control->GetCameraInfo(),&vp_info,camera);
         
-        ubo_camera_info=db->CreateUBO("CameraInfo",sizeof(CameraInfo),&camera_control->GetCameraInfo());
+        ubo_camera_info=db->CreateUBO("CameraInfo",sizeof(CameraInfo),camera_control->GetCameraInfo());
     }
 
     void Resize(uint w,uint h)override
@@ -543,10 +543,10 @@ public:
 
         camera_control->Refresh();
 
-        ubo_camera_info->Write(&camera_control->GetCameraInfo());
+        ubo_camera_info->Write(camera_control->GetCameraInfo());
     }
 
-    CameraInfo &GetCameraInfo()
+    CameraInfo *GetCameraInfo()
     {
         return camera_control->GetCameraInfo();
     }
@@ -562,7 +562,7 @@ public:
     {
         camera_control->Refresh();                                  //更新相机矩阵
 
-        ubo_camera_info->Write(&camera_control->GetCameraInfo());    //写入缓冲区
+        ubo_camera_info->Write(camera_control->GetCameraInfo());    //写入缓冲区
 
         const uint32_t index=AcquireNextImage();
 

inc/hgl/graph/SceneNode.h

@@ -55,6 +55,15 @@ namespace hgl
             Renderable *GetRenderable(){return render_obj;}
             void        SetRenderable(Renderable *);
 
+            SceneNode *AddSubNode(SceneNode *sn)
+            {
+                if(!sn)
+                    return(nullptr);
+
+                SubNode.Add(sn);
+                return sn;
+            }
+
             SceneNode *CreateSubNode()
             {
                 SceneNode *sn=new SceneNode();