Lost normals ...
Blitz3D Forums/Blitz3D Programming/Lost normals ...
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| Hi, I have a problem with my code below, for some reason once I've rebuilt my mesh I can't seem to get the vertex normals for the new model? It's also refusing to accept any light. I've looked over my code and it seems to be okay and I'm now at a loss at what could be causing the problem. If anyone could help I'd be very grateful :) thanx, Mike ;-----------Code starts here ----------- ;******************** ;* * ;* Shoot to Deflate * ;* * ;* by Mike Oakley * ;* * ;******************** Graphics3D 640,480,32,2 SetBuffer BackBuffer() ;AmbientLight 0,0,0 Global sphere=CreateSphere() EntityPickMode sphere,2 Global camera=CreateCamera() MoveEntity camera,0,0,-2 ;Global light=CreateLight() ;MoveEntity light,0,0,3 Global xa#,xb#,xc#,ya#,yb#,yc#,za#,zb#,zc# Global vxa,vya,vxb,vyb,vxc,vyc,nx,ny Global verta,vertb,vertc Global newpointx#,newpointy#,newpointz# Global tria,trib,tric Global tx#,ty#,tz# Global pp Global gbb Dim vertsmain#(CountVertices(GetSurface(sphere,1))*2,2) Dim verts#(CountVertices(GetSurface(sphere,1))*2,2) Dim tris#(CountTriangles(GetSurface(sphere,1))*2,2) Dim newfaces(CountTriangles(GetSurface(sphere,1))*2,2) Dim wobblepos#(CountVertices(GetSurface(sphere,1))*2) Dim tVertexN#(CountVertices(GetSurface(sphere,1))*2,2) Dim Sine#(360) While gg<360 Sine#(gg)=Sin(gg) gg=gg+1 Wend gg=0 gp=0 While gp<CountVertices(GetSurface(sphere,1))*2 wobblepos#(gp)=Rnd(0,360) gp=gp+1 Wend While gk<CountVertices(GetSurface(sphere,1)) vertsmain#(gk,0)=VertexX#(GetSurface(sphere,1),gk) vertsmain#(gk,1)=VertexY#(GetSurface(sphere,1),gk) vertsmain#(gk,2)=VertexZ#(GetSurface(sphere,1),gk) gk=gk+1 Wend gk=0 WireFrame 1 ;******** ;* MAIN * ;******** While Not KeyDown(1)=1 Cls r#=r#+0.5 ;If MouseHit(1)=True Then CameraPick(camera,MouseX(),MouseY()):gettridata():getmeshdata():rebuildmesh() wobblemesh():UpdateWorld():getmeshdata():UpdateWorld():rebuildmesh() RotateMesh sphere,0,r,r UpdateWorld() RenderWorld() printtext() Flip Wend ;***************** ;* Get Mesh Data * ;***************** Function getmeshdata() vv=0 ff=0 Local vertices=CountVertices(GetSurface(sphere,1)) Local faces=CountTriangles(GetSurface(sphere,1)) While vv<vertices verts#(vv,0)=vertsmain#(vv,0) verts#(vv,1)=vertsmain#(vv,1) verts#(vv,2)=vertsmain#(vv,2) vv=vv+1 Wend vv=0 While ff<faces tris#(ff,0)=TriangleVertex(GetSurface(sphere,1),ff,0) tris#(ff,1)=TriangleVertex(GetSurface(sphere,1),ff,1) tris#(ff,2)=TriangleVertex(GetSurface(sphere,1),ff,2) ff=ff+1 Wend ff=0 vv=0 While vv<vertices tVertexN#(vv,0)=VertexNX#(GetSurface(sphere,1),vv) tVertexN#(vv,1)=VertexNY#(GetSurface(sphere,1),vv) tVertexN#(vv,2)=VertexNZ#(GetSurface(sphere,1),vv) If gbb<2 Then DebugLog vv+" = "+VertexNX#(GetSurface(sphere,1),vv) vv=vv+1 Wend vv=0 If gbb=0 Then DebugLog "================================" gbb=gbb+1 End Function ;**************** ;* Rebuild Mesh * ;**************** Function rebuildmesh() vv=0 ff=0 Local vertices=CountVertices(GetSurface(sphere,1)) Local faces=CountTriangles(GetSurface(sphere,1)) FreeEntity sphere sphere=CreateMesh() CreateSurface (sphere) EntityPickMode sphere,2 EntityColor sphere,255,255,255 EntityFX sphere,4 While vv<vertices tx#=Sine#(wobblepos#(vv))/40 ty#=Sine#(wobblepos#(vv))/40 tz#=Sine#(wobblepos#(vv))/40 ;tx#=tVertexN#(vv,0) * Sine#(wobblepos#(vv)) ;ty#=tVertexN#(vv,1) * Sine#(wobblepos#(vv)) ;tz#=tVertexN#(vv,2) * Sine#(wobblepos#(vv)) AddVertex(GetSurface(sphere,1),verts#(vv,0)+tx#,verts#(vv,1)+ty#,verts#(vv,2)+tz#) vv=vv+1 Wend vv=0 While ff<faces AddTriangle(GetSurface(sphere,1),tris#(ff,0),tris#(ff,1),tris#(ff,2)) ff=ff+1 Wend ff=0 End Function ;**************** ;* Get Tri Data * ;**************** Function gettridata() If PickedTriangle()<65535 Then xa#=VertexX(GetSurface(sphere,1),TriangleVertex(GetSurface(sphere,1),PickedTriangle(),0)) If PickedTriangle()<65535 Then ya#=VertexY(GetSurface(sphere,1),TriangleVertex(GetSurface(sphere,1),PickedTriangle(),0)) If PickedTriangle()<65535 Then za#=VertexZ(GetSurface(sphere,1),TriangleVertex(GetSurface(sphere,1),PickedTriangle(),0)) If PickedTriangle()<65535 Then xb#=VertexX(GetSurface(sphere,1),TriangleVertex(GetSurface(sphere,1),PickedTriangle(),1)) If PickedTriangle()<65535 Then yb#=VertexY(GetSurface(sphere,1),TriangleVertex(GetSurface(sphere,1),PickedTriangle(),1)) If PickedTriangle()<65535 Then zb#=VertexZ(GetSurface(sphere,1),TriangleVertex(GetSurface(sphere,1),PickedTriangle(),1)) If PickedTriangle()<65535 Then xc#=VertexX(GetSurface(sphere,1),TriangleVertex(GetSurface(sphere,1),PickedTriangle(),2)) If PickedTriangle()<65535 Then yc#=VertexY(GetSurface(sphere,1),TriangleVertex(GetSurface(sphere,1),PickedTriangle(),2)) If PickedTriangle()<65535 Then zc#=VertexZ(GetSurface(sphere,1),TriangleVertex(GetSurface(sphere,1),PickedTriangle(),2)) If PickedTriangle()<65535 Then CameraProject(camera,xa#,ya#,za#):vxa=ProjectedX():vya=ProjectedY() If PickedTriangle()<65535 Then CameraProject(camera,xb#,yb#,zb#):vxb=ProjectedX():vyb=ProjectedY() If PickedTriangle()<65535 Then CameraProject(camera,xc#,yc#,zc#):vxc=ProjectedX():vyc=ProjectedY() If PickedTriangle()<65535 Then tria=TriangleVertex(GetSurface(sphere,1),PickedTriangle(),0) If PickedTriangle()<65535 Then trib=TriangleVertex(GetSurface(sphere,1),PickedTriangle(),1) If PickedTriangle()<65535 Then tric=TriangleVertex(GetSurface(sphere,1),PickedTriangle(),2) newpointx#=(xa#+xb#+xc#)/3 newpointy#=(ya#+yb#+yc#)/3 newpointz#=(za#+zb#+zc#)/3 If PickedTriangle()<65535 Then CameraProject(camera,newpointx#,newpointy#,newpointz#):nx=ProjectedX():ny=ProjectedY() End Function ;************** ;* Print Text * ;************** Function printtext() Text 10,10,"Triangles = "+CountTriangles(GetSurface(sphere,1)),0,0 Text 10,25,"Vertices = "+CountVertices(GetSurface(sphere,1)),0,0 Text 10,40,"Surfaces = "+CountSurfaces(sphere),0,0 Text 10,80,"tri picked= "+PickedTriangle() Text 10,100," tria = "+tria,0,0 Text 10,120," trib = "+trib,0,0 Text 10,140," tric = "+tric,0,0 Text 10,180,"wobblepos#(0)="+(wobblepos#(0)),0,0 Text 10,200,"wobblepos#(1)="+(wobblepos#(1)),0,0 Text 10,220,"wobblepos#(2)="+(wobblepos#(2)),0,0 Text 10,260,"tx#= "+tVertexN#(10,0),0,0 Color 255,255,0 Rect MouseX()-1,MouseY()-1,2,2 ;While gg<CountVertices(GetSurface(sphere,1)) ; Plot gg,100+(100*Sine#(wobblepos#(gg))) ; gg=gg+1 ;Wend ;gg=0 End Function ;*************** ;* Wobble Mesh * ;*************** Function wobblemesh() gp=0 While gp<CountVertices(GetSurface(sphere,1)) wobblepos#(gp)=wobblepos#(gp)+8 If wobblepos#(gp)>360 Then wobblepos#(gp)=0 gp=gp+1 Wend End Function |
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| You have to use the VertexNormal commands to set the normal of the vertices. Or you could just use UpdateNormals that will set all the normals of a mesh according to his geometry (note that in this case you won't have the control on how the normals are exactly set but in most cases it does exactly what you want anyway). |
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| I could be totally wrong here but I think you have to use UpdateNormals after you use VertexNormal otherwise it doesn't update them. Darkheart |
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| I don't think so. I never use UpdateNormals after setting normals manually. Just make sure the normals you set are unified (have a length on 1). |
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| thanx guys, it was the UpdateNormals that I forgot :) |
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