Second Viewport

Blitz3D Forums/Blitz3D Programming/Second Viewport

MajesticSpaceBen (Posted 2013) [#1]

Basically, I'm trying to display the view of a second camera in the upper right corner of the screen, on top of the existing viewport. I tried simply creating another viewport, but it did not seem to appear. The screen seemed to be unchanged. Any tips on how to do this?

Yasha (Posted 2013) [#2]

I can't remember what actually happens when you have two cameras set to draw over the same area at once but it could be that the ordering isn't well-defined. In that case, you can split your rendering up into two passes: - hide your main camera - draw your small viewport (to anywhere) with RenderWorld - copy your small view to a texture on a quad in the main scene, or just to a texture buffer, with CopyRect - hide your small viewport camera - show your main camera - draw your main scene with RenderWorld - if you put the copy on a quad, it will be drawn as part of the scene; if not, CopyRect it over the scene in a 2D drawing operation now You usually end up doing some variation on this when multiple points of view are involved, as the complexity ratchets up quite quickly anyway and you usually want to start restricting things.

Rroff (Posted 2013) [#3]

If your rendering the smaller overlay viewpoint last after doing the main screen then it _should_ be ordered to display on top - it works correctly for other stuff where you render one scene first with certain settings then render again without clearing z-buffer or color buffer, etc. so aslong as your not sending them to be rendered in the wrong order should show up fine.

MajesticSpaceBen (Posted 2013) [#4]

Graphics3D 1920,1080,0 SetBuffer BackBuffer() ;creates the camera camera=CreateCamera() cam2 = CreateCamera() CameraViewport camera,0,0,1920,1080 CameraViewport cam2,1120,480,800,600 ;loads the world mesh sample=LoadMesh( "models/level_houseTest.3ds" ) ;loads the mesh into the variable 'sample' PositionEntity sample,0,-40,0 tex=LoadTexture( "models/textures/testMap.jpg" ) doorTex = LoadTexture("models/textures/door.png") EntityTexture sample, tex ;textures the world PositionEntity sample, 0, 0, 0 ;sets camera fog CameraFogColor camera,000, 000 ,000 CameraFogRange camera,1, 2000 CameraFogMode camera,1 ;creates a cube serving as the players bounding box playerHull = CreateCube() PositionEntity playerHull,0,64,0 Global testCube = LoadMesh("models/door.3ds") EntityTexture testCube, doorTex PositionEntity testCube,-42,0,-115.5 TurnEntity testCube,0,90,0 Global testCubeState = 0 Global isOpening = 0 Global doorHinge = CreateCube() PositionEntity doorHinge,-42,0,-115.5 EntityAlpha doorHinge, 0 EntityParent testCube, doorHinge EntityRadius playerHull, 3,40 ;sets the entity's collision radius EntityAlpha playerHull, 0 ;sounds snd_step = LoadSound("sounds/step.wav") SoundVolume snd_step,.2 Global snd_door = LoadSound("sounds/door.wav") SoundVolume snd_door,.2 ;sets up and parents the camera to the bounding box EntityParent camera, playerHull ;light AmbientLight 50, 54, 70 ;collision setup type_player = 1 type_world = 2 type_monster = 3 Collisions type_player, type_World, 2, 2 EntityType sample, type_world EntityType playerHull, type_player EntityType testCube, type_world ;view bobbing shoe_size#=5 ; Step speed head_bang_X#=1 ;x range for view bobbing head_bang_Y#=3 ;y range for view bobbing buttonPressed = 0 HidePointer ;============================================================================================= ;functions Function ToggleDoor() If testCubeState = 1 testCubeState = 0 TurnEntity doorHinge, 0, 90, 0 PlaySound snd_door Else testCubeState = 1 TurnEntity doorHinge, 0, -90, 0 PlaySound snd_door EndIf End Function ;============================================================================================= ;game loop While Not KeyHit(1) A# = 2 ;movement speed ;mouselook mxs# = mxs# + MouseXSpeed()/5 mys# = mys# + MouseYSpeed()/5 RotateEntity camera,mys#,0,0 RotateEntity playerHull, 0, -mxs, 0 MoveMouse 100,100 If mxs# > 360 Then mxs# = 0 ;limits of y value of view If mxs# < 0 Then mxs# = 360 If mys# > 80 Then mys# = 80 ;limits of x value of vieww If mys# < -80 Then mys# = -80 ;movement commands If KeyDown(17) Then ;forward movement MoveEntity playerHull,0,0,A# walking=1 EndIf If KeyDown(31) Then ;backwards movement MoveEntity playerHull,0,0,-A# walking=1 EndIf If KeyDown(30) Then ;strafe left MoveEntity playerHull,-A#,0,0 walking=1 EndIf If KeyDown(32) Then ;strafe right MoveEntity playerHull,A#,0,0 walking=1 EndIf ;viewbobbing If walking=1 a1#=(a1#+shoe_size) Mod 360 Else ;a1#=a1#*0.8 EndIf PositionEntity camera,Cos(a1#)*head_bang_X#,Sin(90+a1#*2)*head_bang_Y#,0,0 ;footsteps If Sin(90+a1*2)<-.85 If footstep_needed<>0 Color 255,255,255 PlaySound snd_step footstep_needed=0 EndIf Else footstep_needed=1 EndIf MoveEntity playerhull, 0,-6,0 walking = 0; UpdateWorld RenderWorld If EntityDistance(playerHull, testCube) < 75 Text 10,10,"Press E to open door" If KeyDown(18) And buttonPressed = 0 ToggleDoor() buttonPressed = 1 EndIf If Not KeyDown(18) buttonPressed = 0 EndIf EndIf Text 10,1060,"Door Demo" UpdateWorld RenderWorld Flip Wend End Here's my code, does it seem right?

Floyd (Posted 2013) [#5]

Try creating the cameras in the opposite order. Or use EntityOrder to specify which camera renders last. That's just a guess, but I know I did something like this.