Code archives/3D Graphics - Mesh/Furys Alpha Terrain example.
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This is a 10 hours coding example of how to do vertex alpha terrain in blitz3d. The difirent from moste other sources is that this source has no Zbuffer fights. this makes terrain look good even at long distans. You can have as many layers as you want. just make sure that the mud layer is the highest layer. Contolls are WASD E + Rightmousebutton and mouse to rotate camera. There is 2 examples. an not optimized version and an optimized that do not create unusfully vertex to speed up engine. sourcefile included 2exe. 10mbit host. http://www.tiberion.eu/QueRenderEngine.zip i reject all my claims to this file. i take no responibility use at your own risk and responsbility. if you find anything wrong about it let me know so i can fix the wronges.. | |||||
;Images and compiled examples. ;http://www.tiberion.eu/furysalphademo.zip ;Furys Terrain Alpha Demo ; ;This is a alpha demo that show how to use alpha maps on a surface. ; ;Written by Daniel Eriksson (Tiberion Crew) in 2008-04-13 Global camera Dim verts(65,65,8) ;8 layers of vertices Dim surfs(8) Dim hmap#(1024,1024) Dim TEXTMAP(1024,1024,8) ; this is the textmap buffer Dim Face_NX#(32768) Dim Face_NY#(32768) Dim Face_NZ#(32768) Dim Vertex_ConnectedTris(32768) Dim Vertex_TriList(32768, 32) Global brush_grass,brush_rock,brush_rock2,brush_mud,trisr Global player,playeravtar,camtarketroot,camchasetarget,swimmode Global WX=1024 Global WZ=1024 Graphics3D 1280,800,32,2 SetBuffer BackBuffer() Cls camera=CreateCamera() PositionEntity camera,0,150,0 CameraViewport camera,0,0,1280,800 PositionEntity camera,1,50,0 CameraRange camera,0.1,64 CameraClsColor camera,140,128,255 CameraFogColor camera,138,125,253 CameraFogMode camera,1 CameraFogRange camera,1,64 light=CreateLight() ;Load terrain brushes brush_grass=LoadBrush ("img\grass3.jpg",1,4,4) If brush_grass=0 Then RuntimeError "grass01.jpg not found." BrushFX brush_grass,2+32 brush_rock=LoadBrush ("img\rock3.jpg",1,2,2) If Not brush_rock Then RuntimeError "rock01.jpg not found." BrushFX brush_rock,2+32 brush_rock2=LoadBrush ("img\cliff.jpg",1,8,8) If Not brush_rock2 Then RuntimeError "brush_rock2.bmp not found." BrushFX brush_rock2,2+32 brush_mud=LoadBrush ("img\mudd.jpg",1,8,8) ; (this is base texture no alpha enabled) ;BrushFX brush_mud,2+32 sandplane=CreatePlane() PaintEntity sandplane,brush_mud PositionEntity sandplane,0,-0.5,0 brush_water=LoadBrush("img\water512.jpg",1,8,8) plane=CreatePlane() PaintEntity plane,brush_water PositionEntity plane,0,4.5,0 EntityFX plane,32 EntityAlpha plane,0.66 ;Create a smal whaterlake on the big island lake=CreateCube() laketext=LoadTexture("img\water512.jpg") ScaleTexture laketext,0.2,0.2 ScaleEntity lake,20,0.1,21 EntityTexture lake,laketext EntityFX lake,32 EntityAlpha lake,0.66 PositionEntity lake,134.15,9.335,114.701 ;LoadHeight map image=LoadImage("img\hmap.bmp") If Not image Then RuntimeError "img\hmap.bmp not found." For x=0 To ImageWidth(image) For z=0 To ImageHeight(image) h#=(ReadPixel(x,z,ImageBuffer(image))And 255)/10.0 hmap#(x,z)=h# Next ;z Next ;x ;LoadSandMap smap=LoadImage("img\sandmap.bmp") If Not smap Then RuntimeError "cant find img\sandmap.bmp" ;This init the alpha values in varius planes For x=0 To ImageWidth(image) For z=0 To ImageHeight(image) TEXTMAP(x,z,0)=0 ; Alpha value 0 TEXTMAP(x,z,1)=0 ; Alpha value 0 TEXTMAP(x,z,2)=0 ; Alpha value 0 TEXTMAP(x,z,3)=1 ; Alpha value 1 Next Next ;Montain emulation texturing.. Paint montains For x=1 To ImageWidth(image) For z=1 To ImageHeight(image) sand=ReadPixel(x,z,ImageBuffer(smap)) And $FF testy#=HMAP#(x,z) If testy#<5 ;TEXTMAP(X,Z,2)=1 ;Remed this line out to test if whater works good then normal mapping is enabled Else TEXTMAP(X,Z,2)=1 For testx=-1 To 1 For testz=-1 To 1 If hmap#(testx+x,testz+z)>testy#+0.5 TEXTMAP(x,z,0)=0 TEXTMAP(x,z,1)=1 ;TEXTMAP(testx+x,testz+z,0)=0 ;TEXTMAP(testx+x,testz+z,1)=1 End If ;Verry steep hill If hmap#(testx+x,testz+z)>testy#+1 TEXTMAP(x,z,0)=1 TEXTMAP(x,z,1)=1 TEXTMAP(x,z,3)=1 End If Next Next End If If sand=255 ; ops this is sand so all else is invalid. TEXTMAP(x,z,0)=0 ; Alpha value 0 TEXTMAP(x,z,1)=0 ; Alpha value 0 TEXTMAP(x,z,2)=0 ; Alpha value 0 TEXTMAP(x,z,3)=1 ; Alpha value 1 End If Next Print "Building up montain emulation..."+x Next ;Creates the world meshs For x=0 To ImageWidth(image) Step 63 For z=0 To ImageHeight(image) Step 63 mesh=create_cell(x,z) Next Next While Not KeyHit(1) camera_handling() UpdateWorld RenderWorld Text 0,0,"Tris total "+trisr Text 0,10,"Tris rendered "+TrisRendered() Text 0,20,"FPS: "+fps Text 0,30,"Camera X: "+EntityX(camera) Text 0,40,"Camera Y: "+EntityY(camera) Text 0,50,"Camera Z: "+EntityZ(camera) Flip ct=ct+1 If MilliSecs()-oldms>1000 oldms=MilliSecs() fps=ct ct=0 End If Wend Function create_cell(xoffs,zoffs) ;empty verts For layer=0 To 3 For x=0 To 63 For z=0 To 63 verts(x,z,layer)=-1 Next Next Next ;Create the grass mesh mesh=CreateMesh() For layer=0 To 3 If layer=0 Then surf=CreateSurface(mesh,brush_rock2) If layer=1 Then surf=CreateSurface(mesh,brush_rock) If layer=2 Then surf=CreateSurface(mesh,brush_grass) If layer=3 Then surf=CreateSurface(mesh,brush_mud) For z=0 To 63 For x=0 To 63 ;Check if to skipp creation of this vertex hitt=0 If textmap(x+xoffs,z+zoffs,layer)=1 Then hitt=hitt+1 If textmap(x+xoffs+1,z+zoffs,layer)=1 Then hitt=hitt+1 If textmap(x+xoffs,z+zoffs+1,layer)=1 Then hitt=hitt+1 If textmap(x+xoffs+1,z+zoffs+1,layer)=1 Then hitt=hitt+1 If z>0 And x>0 Then If textmap(x+xoffs-1,z+zoffs-1,layer)=1 Then hitt=hitt+1 If textmap(x+xoffs-1,z+zoffs,layer)=1 Then hitt=hitt+1 If textmap(x+xoffs,z+zoffs-1,layer)=1 Then hitt=hitt+1 End If If layer=3 Then hitt=1 ;Always create if its layer mud If hitt Then verts(X,Z,layer) =AddVertex (surf,X,hmap#(x+xoffs,z+zoffs),Z,X,Z) Next ;X Next ;z ;Add triangles to mesh For z=0 To 62 For x=0 To 62 ;Create this quad if there is vertices available. hitt=0 If verts(x,z,layer)<>-1 Then hitt=hitt+1 ;If verts(x+1,z,layer)<>-1 Then hitt=hitt+1 If verts(x,z+1,layer)<>-1 Then hitt=hitt+1 If verts(x+1,z+1,layer)<>-1 Then hitt=hitt+1 If hitt=3 AddTriangle surf,verts(x,z,layer),verts(x,z+1,layer),verts(x+1,z+1,layer) End If hitt=0 If verts(x,z,layer)<>-1 Then hitt=hitt+1 If verts(x+1,z,layer)<>-1 Then hitt=hitt+1 ;If verts(x,z+1,layer)<>-1 Then hitt=hitt+1 If verts(x+1,z+1,layer)<>-1 Then hitt=hitt+1 If hitt=3 AddTriangle surf,verts(x,z,layer),verts(x+1,z+1,layer),verts(x+1,z,layer) trisr=trisr+1 End If Next ; X Next ;Z ;Montain emulation For x=0 To 63 For z=0 To 63 If verts(x,z,layer)<>-1 VertexColor surf,verts(x,z,layer),255,255,255,0 If TEXTMAP(x+xoffs,z+zoffs,layer)=1 Then VertexColor surf,verts(x,z,layer),255,255,255,255 End If Next ;Z Next ;X Next ; Layer PositionEntity mesh,xoffs,0,zoffs ;UpdateNormals mesh so it have shade. and dont look flat. Calculate_Normals(mesh) Return mesh End Function Function camera_handling() If KeyDown(17) Then MoveEntity camera,0,0,0.02 ;W If KeyDown(18) Then MoveEntity camera,0,0,1 ; E If KeyDown(31) Then MoveEntity camera,0,0,-1 ;S If KeyDown(30) Then MoveEntity camera,-0.02,0,0 ;A If KeyDown(32) Then MoveEntity camera,0.02,0,0 ;D If MouseDown(2) smx#=MouseXSpeed()/10.0 smy#=MouseYSpeed()/10.0 TurnEntity camera,smy#,-smx#,0 RotateEntity camera,EntityPitch#(camera),EntityYaw#(camera),0 ;TranslateEntity camera,0,-0.1,0 MoveMouse GraphicsWidth()/2,GraphicsHeight()/2 End If ; y#=BilinearInterpValue# ( Float(EntityX(camera))/2 ,Float(EntityZ(camera))/2 ) ; If y#+0.5>EntityY#(camera) ; PositionEntity camera,EntityX(camera),y#+0.5,EntityZ(camera) ; End If End Function Function Calculate_Normals(ThisMesh) ; Loop through all surfaces of the mesh. Surfaces = CountSurfaces(ThisMesh) For LOOP_Surface = 1 To Surfaces Surface_Handle = GetSurface(ThisMesh, LOOP_Surface) ; Reset the number of connected polygons for each vertex. For LoopV = 0 To 32767 Vertex_ConnectedTris(LoopV) = 0 Next ; Loop through all triangles in this surface of the mesh. Tris = CountTriangles(Surface_Handle) For LOOP_Tris = 0 To Tris-1 ; Get the vertices that make up this triangle. Vertex_0 = TriangleVertex(Surface_Handle, LOOP_Tris, 0) Vertex_1 = TriangleVertex(Surface_Handle, LOOP_Tris, 1) Vertex_2 = TriangleVertex(Surface_Handle, LOOP_Tris, 2) ; Adjust the number of triangles each vertex is connected to and ; store this triangle in each vertex's list of triangles it is connected to. ConnectedTris = Vertex_ConnectedTris(Vertex_0) Vertex_TriList(Vertex_0, ConnectedTris) = LOOP_Tris Vertex_ConnectedTris(Vertex_0) = ConnectedTris + 1 ConnectedTris = Vertex_ConnectedTris(Vertex_1) Vertex_TriList(Vertex_1, ConnectedTris) = LOOP_Tris Vertex_ConnectedTris(Vertex_1) = ConnectedTris + 1 ConnectedTris = Vertex_ConnectedTris(Vertex_2) Vertex_TriList(Vertex_2, ConnectedTris) = LOOP_Tris Vertex_ConnectedTris(Vertex_2) = ConnectedTris + 1 ; Calculate the normal for this face. ; Get the corners of this face: Ax# = VertexX#(Surface_Handle, Vertex_0) Ay# = VertexY#(Surface_Handle, Vertex_0) Az# = VertexZ#(Surface_Handle, Vertex_0) Bx# = VertexX#(Surface_Handle, Vertex_1) By# = VertexY#(Surface_Handle, Vertex_1) Bz# = VertexZ#(Surface_Handle, Vertex_1) Cx# = VertexX#(Surface_Handle, Vertex_2) Cy# = VertexY#(Surface_Handle, Vertex_2) Cz# = VertexZ#(Surface_Handle, Vertex_2) ; Triangle 1 ; Get the vectors for two edges of the triangle. Px# = Ax#-Bx# Py# = Ay#-By# Pz# = Az#-Bz# Qx# = Bx#-Cx# Qy# = By#-Cy# Qz# = Bz#-Cz# ; Compute their cross product. Nx# = Py#*Qz# - Pz#*Qy# Ny# = Pz#*Qx# - Px#*Qz# Nz# = Px#*Qy# - Py#*Qx# ; Store the face normal. Face_NX#(LOOP_Tris) = Nx# Face_NY#(LOOP_Tris) = Ny# Face_NZ#(LOOP_Tris) = Nz# Next ; Now that all the face normals for this surface have been calculated, calculate the vertex normals. Vertices = CountVertices(Surface_Handle) For LOOP_Vertices = 0 To Vertices-1 ; Reset this normal. Nx# = 0 Ny# = 0 Nz# = 0 ; Add the normals of all polygons which are connected to this vertex. Polys = Vertex_ConnectedTris(LOOP_Vertices) For LOOP_Polys = 0 To Polys-1 ThisPoly = Vertex_TriList(LOOP_Vertices, LOOP_Polys) Nx# = Nx# + Face_NX#(ThisPoly) Ny# = Ny# + Face_NY#(ThisPoly) Nz# = Nz# + Face_NZ#(ThisPoly) Next ; Normalize the new vertex normal. ; (Normalizing is scaling the vertex normal down so that it's length = 1) Nl# = Sqr(Nx#^2 + Ny#^2 + Nz#^2) ; Avoid a divide by zero error if by some freak accident, the vectors add up to 0. ; If Nl# = 0 Then Nl# = 0.1 Nx# = Nx# / Nl# Ny# = Ny# / Nl# Nz# = Nz# / Nl# ; Set the vertex normal. VertexNormal Surface_Handle, LOOP_Vertices, Nx#, Ny#, Nz# ;VertexColor Surface_Handle, LOOP_Vertices, polys*127, polys*127, polys*127 Next Next End Function |
Comments
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Here is the Optimized version. it is good for game play. as it dose not creat unused vertexs. so its less GPU intensive. Another way to optimize speed is to limit camera range this way GPU will not render cells that is not on screen. |
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Where can we get the media? |
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[Where can we get the media? ;Images and compiled examples. ;http://www.tiberion.com/furysalphademo.zip |
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For you information Function Calculate_Normals(ThisMesh) It is the best function of all.. thanks for the one who created it. (i discovered that build in vertex normal has serius bugg..) |
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just a warning note .. readpixelfast is 10 times slower in version 1.99 than in v1.98 |
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Heres a link to a compiled example. and newest version http://www.tiberion.eu/QueRenderEngine.zip NewFeatures: 5000x5000 heightmap QueBased render. makes it stable at 60 fps. it means i made render a little complicated. but to explain it easy it renders a little now and then based on a render que i made up.. using types. CopyFreeNotice: The file aboove is publicdomain and you may sell it and profit for it. you dont have to mention me in creddits and you may copy and spread it on internet and its ok to use this file in public television and sattelites and radio bradcast it is also ok. its ok to have this file in the car but i dont recomend it as i take no responsibillity if you or anyone gets hurts. i take no responibility for anything this file can do to you computer, or if your fuse went out or house burnsout. in facr i have no responybility att all to this file. You may not however place this file under copyright by the way it its you must change somthing first on order to do that. |
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its ok to use this file in public television and sattelites and radio bradcast How do you use a terrain renderer in a radio broadcast?P.S. That's one of the funniest "CopyFreeNotice"'s I've ever read. |
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You beam it to your satellite first. I thought that was obvious. |
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Now to the most funny part.. all these terrain coding and looking nice.. but sens dx7 is as it is.. i have no use for the above code ? Sens i want water fire and magic all uses alpha meshes so makes the above useless. I made fast decicion this summer to use vertex color.. for terrain. |
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