; CreateMyCylinder Example
; ----------------------
; By Pigmin (alias Olive) 02-20-2004
;
; pigmin@wanadoo.fr
;
; meet me at http://www.blitz3dfr.com (forum section)
;
;
;
; With wonderfull function :
;
; CreateMyCylinder
; ----------------------
; By: Todd Riggins 12-22-2003
;
; a CreateCylinder blitz-like function. Does the Same thing. Just wanted to do
; this to see how to actaully create a cylinder with the addvertex/addtriangle
; commands. Just thought I would share.
; -----------------
; 2004-2-19 1:10:00
; - Added ring segments. Ring Segment param of zero acts like the
; blitz-like Function. IE: no ring segments.
; - The added ring segments adds vertices to help bend cylinder tunnels or angle
; pipe meshs. Ofcoarse, you will need to add your own code to manipulate the
; cylinder's vertices.
; 2004-2-18 21:00:00
; - Fixed normal vectors problem: Needed to have cylinder ends as seperate surface
;
; Left sphere is created by the CreateMyCylinder function.
; Right sphere is created by blitz's CreateCylinder command.
;
; Controls:
; - Use mouse to rotate the cylinders
; - wireframe toggle
; - Esc key to escape
; rediminsionable arrays
Dim tRing(0)
Dim bRing(0)
Type TCtrlPoint
Field x#
Field y#
End Type
Const MAX_CTRL_POINTS = 16
Const TWIST# = 30
Global CtrlPoints.TCtrlPoint[MAX_CTRL_POINTS]
Global CtrlPointsPhase% = 0
Global CtrlPointsPhase2% = 0
Graphics3D 640,480,0,2
SetBuffer BackBuffer()
AmbientLight 32,0,0
camera=CreateCamera()
CameraRange camera,.1,2000
light=CreateLight()
RotateEntity light,90,0,0
; enter how many segments the sphere has
Global vsegs=32
Global rsegs=MAX_CTRL_POINTS
;Texture
tex=CreateTexture(32,32,1+8)
SetBuffer(TextureBuffer(tex))
colR = 128
For j = 0 To 31 Step 8
colR = 64 - colR
For i = 0 To 31 Step 8
colR = 64 - colR
Color colR,colR,colR
Rect(i,j,8,8,1)
Next
Next
SetBuffer (BackBuffer())
ScaleTexture tex,.25,.25
;Texture2
tex2=CreateTexture(64,64,1+4+8)
SetBuffer(TextureBuffer(tex2))
For j = 0 To 16
colR = Rand(10,64)
colG = Rand(0,128)
colB = Rand(0,180)
Color colR,colG,colB
Rect(Rand(0,63),Rand(0,63),Rand(1,2),Rand(1,31))
Rect(Rand(0,63),Rand(0,63),Rand(1,31),Rand(1,2))
Next
SetBuffer (BackBuffer())
ScaleTexture tex2,.1,.25
TextureBlend tex,2
TextureBlend tex2,3
; Create Cylinder manually
mycylinder=CreateMyCylinder(vsegs,rsegs,False,0)
ScaleMesh mycylinder,6,40,6
RotateMesh mycylinder,90,0,0
FlipMesh mycylinder
PositionEntity mycylinder,0,0,39
EntityTexture mycylinder,tex,0,0
EntityTexture mycylinder,tex2,0,1
mycylindercopy = CopyMesh(mycylinder)
HideEntity mycylindercopy
;allocate control points
For i = 0 To MAX_CTRL_POINTS
CtrlPoints[i] = New TCtrlPoint
CtrlPoints[i]\x# = (i*260/MAX_CTRL_POINTS)
CtrlPoints[i]\y# = (i*460/MAX_CTRL_POINTS)
Next
; key helper
wkey=0
xx#=0
cnt#=0
freqX = 1
freqY = 1
While Not KeyDown( 1 )
Tunnel_effect(mycylinder, mycylindercopy, CtrlPointsPhase, CtrlPointsPhase2)
CtrlPointsPhase = CtrlPointsPhase + freqX
CtrlPointsPhase2 = CtrlPointsPhase2 + freqY
If (Not Rand(0,200))
freqY = Rand(0,4)
EndIf
If (Not Rand(0,400))
freqX = Rand(1,4)
EndIf
PositionTexture Tex,0,cnt#
PositionTexture Tex2,cnt#,cnt#
cnt#=cnt#+.01*(freqX+freqY)*.5
If KeyDown(17) And wkey=0
wkey=1
EndIf
If KeyDown(17)=False And wkey=1
wkey=0
If wframe=0
wframe=1
Else
wframe=0
EndIf
If wframe=0 WireFrame False
If wframe=1 WireFrame True
EndIf
RenderWorld
Flip
Wend
End
; ---------------------------------------------------------
Function CreateMyCylinder(verticalsegments,ringsegments=0,solid=True,parent=0)
Local tr,tl,br,bl; side of cylinder
Local ts0,ts1,newts; top side vertexs
Local bs0,bs1,newbs; bottom side vertexs
If verticalsegments<3 Or verticalsegments>100 Then Return 0
If ringsegments<0 Or ringsegments>100 Then Return 0
thiscylinder=CreateMesh(parent)
thissurf=CreateSurface(thiscylinder)
If solid=True
thissidesurf=CreateSurface(thiscylinder)
EndIf
div#=Float(360.0/(verticalsegments))
height#=1.0
ringSegmentHeight#=(height#*2.0)/(ringsegments+1)
upos#=1.0
udiv#=Float(1.0/(verticalsegments))
vpos#=1.0
vdiv#=Float(1.0/(ringsegments+1))
SideRotAngle#=90
; re-diminsion arrays to hold needed memory.
; this is used just for helping to build the ring segments...
Dim tRing(verticalsegments)
Dim bRing(verticalsegments)
;render end caps if solid
If solid=True
XPos#=-Cos(SideRotAngle#)
ZPos#=Sin(SideRotAngle#)
ts0=AddVertex(thissidesurf,XPos#,height,ZPos#,XPos#/2.0+0.5,ZPos#/2.0+0.5)
bs0=AddVertex(thissidesurf,XPos#,-height,ZPos#,XPos#/2.0+0.5,ZPos#/2.0+0.5)
SideRotAngle#=SideRotAngle#+div#
XPos#=-Cos(SideRotAngle#)
ZPos#=Sin(SideRotAngle#)
ts1=AddVertex(thissidesurf,XPos#,height,ZPos#,XPos#/2.0+0.5,ZPos#/2.0+0.5)
bs1=AddVertex(thissidesurf,XPos#,-height,ZPos#,XPos#/2.0+0.5,ZPos#/2.0+0.5)
For i=1 To (verticalsegments-2)
SideRotAngle#=SideRotAngle#+div#
XPos#=-Cos(SideRotAngle#)
ZPos#=Sin(SideRotAngle#)
newts=AddVertex(thissidesurf,XPos#,height,ZPos#,XPos#/2.0+0.5,ZPos#/2.0+0.5)
newbs=AddVertex(thissidesurf,XPos#,-height,ZPos#,XPos#/2.0+0.5,ZPos#/2.0+0.5)
AddTriangle(thissidesurf,ts0,ts1,newts)
AddTriangle(thissidesurf,newbs,bs1,bs0)
If i<(verticalsegments-2)
ts1=newts
bs1=newbs
EndIf
Next
EndIf
; -----------------------
; middle part of cylinder
thisHeight#=height#
; top ring first
SideRotAngle#=90
XPos#=-Cos(SideRotAngle#)
ZPos#=Sin(SideRotAngle#)
thisUPos#=upos#
thisVPos#=0
tRing(0)=AddVertex(thissurf,XPos#,thisHeight,ZPos#,thisUPos#,thisVPos#)
For i=0 To (verticalsegments-1)
SideRotAngle#=SideRotAngle#+div#
XPos#=-Cos(SideRotAngle#)
ZPos#=Sin(SideRotAngle#)
thisUPos#=thisUPos#-udiv#
tRing(i+1)=AddVertex(thissurf,XPos#,thisHeight,ZPos#,thisUPos#,thisVPos#)
Next
For ring=0 To (ringsegments)
; decrement vertical segment
thisHeight=thisHeight-ringSegmentHeight#
; now bottom ring
SideRotAngle#=90
XPos#=-Cos(SideRotAngle#)
ZPos#=Sin(SideRotAngle#)
thisUPos#=upos#
thisVPos#=thisVPos#+vdiv#
bRing(0)=AddVertex(thissurf,XPos#,thisHeight,ZPos#,thisUPos#,thisVPos#)
For i=0 To (verticalsegments-1)
SideRotAngle#=SideRotAngle#+div#
XPos#=-Cos(SideRotAngle#)
ZPos#=Sin(SideRotAngle#)
thisUPos#=thisUPos#-udiv#
bRing(i+1)=AddVertex(thissurf,XPos#,thisHeight,ZPos#,thisUPos#,thisVPos#)
Next
; Fill in ring segment sides with triangles
For v=1 To (verticalsegments)
tl=tRing(v)
tr=tRing(v-1)
bl=bRing(v)
br=bRing(v-1)
AddTriangle(thissurf,tl,tr,br)
AddTriangle(thissurf,bl,tl,br)
Next
; make bottom ring segmentthe top ring segment for the next loop.
For v=0 To (verticalsegments)
tRing(v)=bRing(v)
Next
Next
UpdateNormals thiscylinder
Return thiscylinder
End Function
Function Tunnel_Effect(mesh, mesh_original, phase, phase2)
cntsurf = CountSurfaces(mesh)
surf=GetSurface(mesh,cntsurf)
surf_original=GetSurface(mesh_original,cntsurf)
cnt=CountVertices(surf)
For s=0 To rsegs
deltax# = Cos(CtrlPoints[s]\x# + phase)*(TWIST#/(s+1))
deltay# = Sin(CtrlPoints[s]\y# + phase2)*(TWIST#/(s+1))
firstVertice = s*(vsegs+1)
endVertice = firstVertice + vsegs
For a=firstVertice To endVertice
x#=VertexX#(surf_original,a)
y#=VertexY#(surf_original,a)
z#=VertexZ#(surf_original,a)
x#=x#+deltax#
y#=y#+deltay#
VertexCoords surf,a,x#,y#,z#
Next
Next
UpdateNormals mesh
End Function |
