iGeo Tutorials

Python Tutorials

Panelization Examples

Panelization Example10

The following example shows panelization of a deformed input surface and a layering technique of multiple image maps. The input square surface is already deformed by tweaking control points. The panelization follows this deformed internal grid.

The input file used in the example is this.

surface11.3dm

add_library('igeo')

size(480, 360, IG.GL)

IG.open("surface11.3dm")
surfaces = IG.surfaces()

for surf in surfaces : 
    unum = 30
    vnum = 30
    uinc = 1.0/unum
    vinc = 1.0/vnum
    gap = 0.25
    for i in range(unum) : 
        for j in range(vnum) : 
             pt1 = surf.pt( i*uinc, j*vinc )
             pt2 = surf.pt( (i+1-gap)*uinc, j*vinc )
             pt3 = surf.pt( (i+1-gap)*uinc, (j+1-gap)*vinc )
             pt4 = surf.pt( i*uinc, (j+1-gap)*vinc )
             ISurface(pt1,pt2,pt3,pt4)
    surf.del()

In the following code, divided rectangular cell is randomly triangulated. The surface is created by offset of the triangular or rectangular cell and extrusion.

add_library('igeo')

size(480, 360, IG.GL)

IG.open("surface11.3dm")
surfaces = IG.surfaces()

for surf in surfaces : 
    unum = 30
    vnum = 30
    uinc = 1.0/unum
    vinc = 1.0/vnum
    offsetDist = -0.04
    degree = 1 # 1 or 2
    for i in range(unum) : 
        for j in range(vnum) : 
            pt1 = surf.pt( i*uinc, j*vinc )
            pt2 = surf.pt( (i+1)*uinc, j*vinc )
            pt3 = surf.pt( (i+1)*uinc, (j+1)*vinc )
            pt4 = surf.pt( i*uinc, (j+1)*vinc )
            
            if IRand.pct(30) :  # rectangle
                crv = ICurve([ pt1, pt2, pt3, pt4 ], degree, True)
                offCrv = IG.offset(crv, offsetDist)
                IG.extrude(offCrv, -4).clr(0.2)
            elif IRand.pct(30) :  # triangles
                crv = ICurve([ pt1, pt2, pt3 ], degree, True)
                offCrv = IG.offset(crv, offsetDist)
                IG.extrude(offCrv, -2).clr(0.2)
                
                crv2 = ICurve([ pt1, pt3, pt4 ], degree, True)
                offCrv2 = IG.offset(crv2, offsetDist)
                IG.extrude(offCrv2, -2).clr(0.2)
            else : # triangles in other direction
                crv = ICurve([ pt1, pt2, pt4 ], degree, True)
                offCrv = IG.offset(crv, offsetDist)
                IG.extrude(offCrv, -1).clr(0.2)
                
                crv2 = ICurve([ pt2, pt3, pt4 ], degree, True)
                offCrv2 = IG.offset(crv2, offsetDist)
                IG.extrude(offCrv2, -1).clr(0.2)
    surf.del()

If you change the variable degree from 1 to 2, it change the profile from polyline to curve and the extruded surface also get curved.

add_library('igeo')

size(480, 360, IG.GL)

IG.open("surface11.3dm")
surfaces = IG.surfaces()

for surf in surfaces : 
    unum = 30
    vnum = 30
    uinc = 1.0/unum
    vinc = 1.0/vnum
    offsetDist = -0.04
    degree = 2; # 1 or 2
    for i in range(unum) : 
        for j in range(vnum) : 
            pt1 = surf.pt( i*uinc, j*vinc )
            pt2 = surf.pt( (i+1)*uinc, j*vinc )
            pt3 = surf.pt( (i+1)*uinc, (j+1)*vinc )
            pt4 = surf.pt( i*uinc, (j+1)*vinc )
            if IRand.pct(30) : # rectangle
                crv = ICurve([ pt1, pt2, pt3, pt4 ], degree, True)
                offCrv = IG.offset(crv, offsetDist)
                IG.extrude(offCrv, -4).clr(0.2)
            elif IRand.pct(30) : # triangles
                crv = ICurve([ pt1, pt2, pt3 ], degree, True)
                offCrv = IG.offset(crv, offsetDist)
                IG.extrude(offCrv, -2).clr(0.2)
                
                crv2 = ICurve([ pt1, pt3, pt4 ], degree, True)
                offCrv2 = IG.offset(crv2, offsetDist)
                IG.extrude(offCrv2, -2).clr(0.2)
            else : # triangles in other direction
                crv = ICurve([ pt1, pt2, pt4 ], degree, True)
                offCrv = IG.offset(crv, offsetDist)
                IG.extrude(offCrv, -1).clr(0.2)
                
                crv2 = ICurve([ pt2, pt3, pt4 ], degree, True)
                offCrv2 = IG.offset(crv2, offsetDist)
                IG.extrude(offCrv2, -1).clr(0.2)
    surf.del()

The following code takes 1 bitmap input. The bitmap defines void area. When the value of bitmap is less than 0.5 (dark), the geometry is created and otherwise not.

The below is "voidmap.jpg"

add_library('igeo')

size(480, 360, IG.GL)

IG.open("surface11.3dm")
surfaces = IG.surfaces()

map1 = IImageMap("voidmap.jpg")

for surf in surfaces : 
    unum = 30
    vnum = 30
    uinc = 1.0/unum
    vinc = 1.0/vnum
    offsetDist = -0.04
    degree = 1; # 1 or 2
    for i in range(unum) : 
        for j in range(vnum) : 
            pt1 = surf.pt( i*uinc, j*vinc )
            pt2 = surf.pt( (i+1)*uinc, j*vinc )
            pt3 = surf.pt( (i+1)*uinc, (j+1)*vinc )
            pt4 = surf.pt( i*uinc, (j+1)*vinc )
            
            if map1.get( (i+0.5)*uinc, (j+0.5)*vinc ) < 0.5 : 
                if IRand.pct(30) : 
                    crv = ICurve([ pt1, pt2, pt3, pt4 ], degree, True)
                    offCrv = IG.offset(crv, offsetDist)
                    IG.extrude(offCrv, -3).clr(0.2)
                elif IRand.pct(30) :
                    crv = ICurve([ pt1, pt2, pt3 ], degree, True)
                    offCrv = IG.offset(crv, offsetDist)
                    IG.extrude(offCrv, -2).clr(0.2)
                    
                    crv2 = ICurve([ pt1, pt3, pt4 ], degree, True)
                    offCrv2 = IG.offset(crv2, offsetDist)
                    IG.extrude(offCrv2, -2).clr(0.2)
                else : 
                    crv = ICurve([ pt1, pt2, pt4 ], degree, True)
                    offCrv = IG.offset(crv, offsetDist)
                    IG.extrude(offCrv, -1).clr(0.2)
        	    
                    crv2 = ICurve([ pt2, pt3, pt4 ], degree, True)
                    offCrv2 = IG.offset(crv2, offsetDist)
                    IG.extrude(offCrv2, -1).clr(0.2)
    surf.del()

The following code takes 5 image maps. Each of them defines, void, height, randomization of height, condition to be triangulated or not, and color.

Here are "voidmap.jpg", "heightmap.jpg", "heightRandomizeMap.jpg", "divisionmap.jpg" and "colormap.jpg".

add_library('igeo')

size(480, 360, IG.GL)

IG.open("surface11.3dm")
surfaces = IG.surfaces()

map1 = IImageMap("voidmap.jpg")
map2 = IImageMap("heightmap.jpg")
map3 = IImageMap("heightRandomizeMap.jpg")
map4 = IImageMap("divisionmap.jpg")
map5 = IImageMap("colormap.jpg")

for surf in surfaces : 
    unum = 30
    vnum = 30
    uinc = 1.0/unum
    vinc = 1.0/vnum
    offsetDist = -0.04
    degree = 1; # 1 or 2
    maxHeight = 2
    heightRandomizeRange = 2.5
    for i in range(unum) : 
        for j in range(vnum) : 
            pt1 = surf.pt( i*uinc, j*vinc )
            pt2 = surf.pt( (i+1)*uinc, j*vinc )
            pt3 = surf.pt( (i+1)*uinc, (j+1)*vinc )
            pt4 = surf.pt( i*uinc, (j+1)*vinc )
            
            division = map4.get((i+0.5)*uinc,(j+0.5)*vinc)*maxHeight
            height = map2.get((i+0.5)*uinc,(j+0.5)*vinc)*maxHeight
            height += map3.get((i+0.5)*uinc,(j+0.5)*vinc) * \
                IRand.get(0,heightRandomizeRange);
            
            if map1.get( (i+0.5)*uinc, (j+0.5)*vinc ) < 0.5 : 
                if division < 0.5 : 
                    crv = ICurve([ pt1, pt2, pt3, pt4 ], degree, True)
                    offCrv = IG.offset(crv, offsetDist)
                    IG.extrude(offCrv, -height).clr(map5.clr((i+0.5)*uinc, (j+0.5)*vinc))
                elif IRand.pct(50) : 
                    crv = ICurve([ pt1, pt2, pt3 ], degree, True)
                    offCrv = IG.offset(crv, offsetDist)
                    IG.extrude(offCrv, -height).clr(map5.clr((i+0.5)*uinc, (j+0.5)*vinc))
                    
                    crv2 = ICurve([ pt1, pt3, pt4 ], degree, True)
                    offCrv2 = IG.offset(crv2, offsetDist)
                    IG.extrude(offCrv2, -height).clr(map5.clr((i+0.5)*uinc, (j+0.5)*vinc))
                else : 
                    crv = ICurve([ pt1, pt2, pt4 ], degree, True)
                    offCrv = IG.offset(crv, offsetDist)
                    IG.extrude(offCrv, -height).clr(map5.clr((i+0.5)*uinc, (j+0.5)*vinc))
                    
                    crv2 = ICurve([ pt2, pt3, pt4 ], degree, True)
                    offCrv2 = IG.offset(crv2, offsetDist)
                    IG.extrude(offCrv2, -height).clr(map5.clr((i+0.5)*uinc, (j+0.5)*vinc))
    surf.del()

The following is in case the variable degree is changed to 2.

add_library('igeo')

size(480, 360, IG.GL)

IG.open("surface11.3dm")
surfaces = IG.surfaces()

map1 = IImageMap("voidmap.jpg")
map2 = IImageMap("heightmap.jpg")
map3 = IImageMap("heightRandomizeMap.jpg")
map4 = IImageMap("divisionmap.jpg")
map5 = IImageMap("colormap.jpg")

for surf in surfaces : 
    unum = 30
    vnum = 30
    uinc = 1.0/unum
    vinc = 1.0/vnum
    offsetDist = -0.04
    degree = 2 # 1 or 2
    maxHeight = 2
    heightRandomizeRange = 2.5
    for i in range(unum) : 
        for j in range(vnum) : 
            pt1 = surf.pt( i*uinc, j*vinc )
            pt2 = surf.pt( (i+1)*uinc, j*vinc )
            pt3 = surf.pt( (i+1)*uinc, (j+1)*vinc )
            pt4 = surf.pt( i*uinc, (j+1)*vinc )
            
            division = map4.get((i+0.5)*uinc,(j+0.5)*vinc)*maxHeight
            height = map2.get((i+0.5)*uinc,(j+0.5)*vinc)*maxHeight
            height += map3.get((i+0.5)*uinc,(j+0.5)*vinc)*IRand.get(0,heightRandomizeRange)
            
            if map1.get( (i+0.5)*uinc, (j+0.5)*vinc ) < 0.5 : 
                if division < 0.5 : 
                    crv = ICurve([ pt1, pt2, pt3, pt4 ], degree, True)
                    offCrv = IG.offset(crv, offsetDist)
                    IG.extrude(offCrv, -height).clr(map5.clr((i+0.5)*uinc, (j+0.5)*vinc))
                elif IRand.pct(50) : 
                    crv = ICurve([ pt1, pt2, pt3 ], degree, True)
                    offCrv = IG.offset(crv, offsetDist)
                    IG.extrude(offCrv, -height).clr(map5.clr((i+0.5)*uinc, (j+0.5)*vinc))
                    
                    crv2 = ICurve([ pt1, pt3, pt4 ], degree, True)
                    offCrv2 = IG.offset(crv2, offsetDist)
                    IG.extrude(offCrv2, -height).clr(map5.clr((i+0.5)*uinc, (j+0.5)*vinc))
                else : 
                    crv = ICurve([ pt1, pt2, pt4 ], degree, True);
                    offCrv = IG.offset(crv, offsetDist)
                    IG.extrude(offCrv, -height).clr(map5.clr((i+0.5)*uinc, (j+0.5)*vinc))
                    
                    crv2 = ICurve([ pt2, pt3, pt4 ], degree, True)
                    offCrv2 = IG.offset(crv2, offsetDist)
                    IG.extrude(offCrv2, -height).clr(map5.clr((i+0.5)*uinc, (j+0.5)*vinc))
    surf.del()

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