Z Depth Perspective For Sprites

[kevin]

 Z Depth Perspective For Sprites

  Here's a simpler variation of the classic 'CustomSceneDepth' example you'll find the example pack under Demos.  It shows how you can project 3D space (none rotated) into 2D screen coordinates.   From there it's just matter of scaling our media to fit the required size.  In this version I've used a sprite, but you can use Polygons (TexturedQuads), Shapes, Images. whatever..  


  Requires PlayBasic V1.64L

PlayBASIC Code: [Select]

   Setfps 60

   Size=256
   Img=NewfXimage(size,size)
   RenderPhongImage img,size/2,size/2,$ff0000,256,2


   ProjectionX#=400
   ProjectionY#=400

   ; objects Width and Height and depth in the scene
   ObjectWidth=size
   ObjectHeight=size
   ObjectDepth=5000

   ; use a spritge to represent this object on screen
   Spr=NewSprite(0,0,img)
   SpriteDrawMode Spr,2
   AutoCenterSpriteHandle spr,true

   Do
         ; Clear the screen
         Cls 

         ; project the obejcts screenwidth and height at this depth
         ScreenWidth#=(ObjectWidth*ProjectionX#)/ObjectDepth
         ScreenHeight#=(ObjectHeight*ProjectionY#)/ObjectDepth
         
         ScaleX#=ScreenWidth#/GetImageWidth(img)
         ScaleY#=ScreenHeight#/GetImageHeight(img)
         positionsprite spr,GetScreenWidth()/2,GetScreenHeight()/2
         ScaleSpriteXY spr,scaleX#,scaley#
         SpriteTint Spr, rgbdepthcue($ffffff,0,Objectdepth,500,2500)
         drawsprite Spr
         
         ObjectDepth=wrapvalue(ObjectDepth-10,50,2500)

      Sync
   loop

Related To:

  2.5D Rugby Source
  Manual Projection/Scene Perspective
  Mip Mapped Image Zoomer