VB6 Dex3D.frm

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Refactoring Dex3D ⋅  Category:QuasiVisual3D ⋅  QuasiVisual3D.frm ⋅  Dex3D.frm ⋅  Dex3D Engine ⋅ 

After refactoring the code found below, the following code creates rather a function for direct-calling of scene-rendering, which is called from various points in the project code, where previously a flag was set to invoked a forever-loop (now replaced) to redraw the screen once while looping forever.  This direct-call approach is now working by Windows events, like mouse-movements, to invoke a screen refresh.

The new refactored method, RefreshScene(), is found in the startup-form, Dex3D.frm now renamed to VB6_QuasiVisual3D.frm.

VB6 RefreshScene() method reworked from startup-form Dex3D.frm

Private Sub RefreshScene()
    
    If LockCamera = True Then
        VLight(MyLight).Origin = _
            VectorAdd( _
                VectorNull, _
                VectorScale( _
                    OrientationToVector(OrientationInput(0, OrbitLatitude, -OrbitLongitude)), _
                    -OrbitRadius _
                ) _
            )
        If CameraModel <> 0 Then
            VMesh(CameraModel).Origin = VLight(MyLight).Origin
            VMesh(CameraModel).Angles.Pitch = OrbitLatitude
            VMesh(CameraModel).Angles.Yaw = -OrbitLongitude
            VMesh(CameraModel).UpdateTransformation = True
        End If
    
    Else
        
        Call OrbitCamera(MyCamera, VectorNull, OrbitRadius, OrbitLongitude, OrbitLatitude)
        VLight(MyLight).Origin = VCamera(MyCamera).Origin
    
    End If
    
    ''  Render the new bitmap
    paintCanvas Picture1
    
End Sub


Sub paintCanvas(C As PictureBox)
    C.Cls
    RenderImage C, MyCamera
    
    LastFaceOver = 0  ''  The active mesh face(triangle) under the mouse pointer.
    
    ''  Print UI properties to the canvas  ''
    C.ForeColor = vbWhite
    C.Print "Longitude: " & Int(RadianToDegree(OrbitLongitude))
    C.Print "Latitude: " & Int(RadianToDegree(OrbitLatitude))
    C.Print "Radius: " & Int(OrbitRadius)
    C.Print
    C.Print "Name: " & VMesh(MyMesh).Tag
    C.Print "Vertices: " & VMesh(MyMesh).Vertices.Length
    C.Print "Faces: " & VMesh(MyMesh).Faces.Length
    
End Sub

Following is a nearly original Dex3D method, which created a forever-loop for flagged-repaints in the VB6 Form_Activate() event.

Private Sub Form_Activate()
    Debug.Print "Beginning Form_Activate()"
    
    'Dim FrameRate As Single ''obsoleted by event-driven drawing
    
    If BeginRenderLoop = True Then
        ''  Run render loop once  ''
        BeginRenderLoop = False
        
        Do Until (RenderLoopCanceled) '' Added RenderLoopCanceled by XenoEngineer
            If RefreshScene = True Then
                RefreshScene = False
                
                LastFaceOver = 0
                If LockCamera = True Then
                    VLight(MyLight).Origin = _
                        VectorAdd( _
                            VectorNull, _
                            VectorScale( _
                                OrientationToVector(OrientationInput(0, OrbitLatitude, -OrbitLongitude)), _
                                -OrbitRadius _
                            ) _
                        )
                    If CameraModel <> 0 Then
                        VMesh(CameraModel).Origin = VLight(MyLight).Origin
                        VMesh(CameraModel).Angles.Pitch = OrbitLatitude
                        VMesh(CameraModel).Angles.Yaw = -OrbitLongitude
                        VMesh(CameraModel).UpdateTransformation = True
                    End If
                Else
                    Call OrbitCamera(MyCamera, VectorNull, OrbitRadius, OrbitLongitude, OrbitLatitude)
                    VLight(MyLight).Origin = VCamera(MyCamera).Origin
                End If
                
                Picture1.Cls
                Call RenderImage(Picture1, MyCamera)
                Picture1.ForeColor = vbWhite
                Picture1.Print "Longitude: " & Int(RadianToDegree(OrbitLongitude))
                Picture1.Print "Latitude: " & Int(RadianToDegree(OrbitLatitude))
                Picture1.Print "Radius: " & Int(OrbitRadius)
                Picture1.Print
                Picture1.Print "Name: " & VMesh(MyMesh).Tag
                Picture1.Print "Vertices: " & VMesh(MyMesh).Vertices.Length
                Picture1.Print "Faces: " & VMesh(MyMesh).Faces.Length
            End If
            
            DoEvents
        Loop
        
    End If
    Debug.Print "Ending Form_Activate()"
    
End Sub