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**GLBasic - en / Re: Anyone got code for a 3D(or flat) Hexagon?**

« **on:**2019-Oct-14 »

A 3D hexagon (or hexagonal prism) is just a particular cylinder.

If you use this function with slices=6, you normally get a hexagonal prism (I have not tested).

CreateCylinder(0, 16, 16, 16, 6, 1, RGB(255, 0, 0))

FUNCTION CreateCylinder: num, baseRadius, topRadius, height, slices, stacks, col

LOCAL da, r, dr, dz, x, y, z, i, j

LOCAL x1, y1, x2, y2

da = 360 / slices

dr = (topRadius-baseRadius) / stacks

dz = height / stacks

X_AUTONORMALS 2

X_OBJSTART num

FOR i=0 TO slices-1

x1 = COS(i*da)

y1 = SIN(i*da)

x2 = COS((i+1)*da)

y2 = SIN((i+1)*da)

z = 0

r = baseRadius

// Bottom lid

IF baseRadius>0

X_OBJADDVERTEX 0, 0, 0, .5, .5, col

X_OBJADDVERTEX x1*r, y1*r, 0, x1/2+.5, y1/2+.5, col

X_OBJADDVERTEX x2*r, y2*r, 0, x2/2+.5, y2/2+.5, col

X_OBJNEWGROUP

ENDIF

// side

FOR j=0 TO stacks

X_OBJADDVERTEX x2*r, y2*r, z, (i+1)/slices, j/stacks, col

X_OBJADDVERTEX x1*r, y1*r, z, i /slices, j/stacks, col

z = z+dz

r = r+dr

NEXT

// Top lid

IF topRadius>0

X_OBJNEWGROUP

X_OBJADDVERTEX x2*r, y2*r, height, x2/2+.5, y2/2+.5, col

X_OBJADDVERTEX x1*r, y1*r, height, x1/2+.5, y1/2+.5, col

X_OBJADDVERTEX 0, 0, height, .5, .5, col

ENDIF

X_OBJNEWGROUP

NEXT

X_OBJEND

ENDFUNCTION

If you use this function with slices=6, you normally get a hexagonal prism (I have not tested).

CreateCylinder(0, 16, 16, 16, 6, 1, RGB(255, 0, 0))

Code: GLBasic [Select]

FUNCTION CreateCylinder: num, baseRadius, topRadius, height, slices, stacks, col

LOCAL da, r, dr, dz, x, y, z, i, j

LOCAL x1, y1, x2, y2

da = 360 / slices

dr = (topRadius-baseRadius) / stacks

dz = height / stacks

X_AUTONORMALS 2

X_OBJSTART num

FOR i=0 TO slices-1

x1 = COS(i*da)

y1 = SIN(i*da)

x2 = COS((i+1)*da)

y2 = SIN((i+1)*da)

z = 0

r = baseRadius

// Bottom lid

IF baseRadius>0

X_OBJADDVERTEX 0, 0, 0, .5, .5, col

X_OBJADDVERTEX x1*r, y1*r, 0, x1/2+.5, y1/2+.5, col

X_OBJADDVERTEX x2*r, y2*r, 0, x2/2+.5, y2/2+.5, col

X_OBJNEWGROUP

ENDIF

// side

FOR j=0 TO stacks

X_OBJADDVERTEX x2*r, y2*r, z, (i+1)/slices, j/stacks, col

X_OBJADDVERTEX x1*r, y1*r, z, i /slices, j/stacks, col

z = z+dz

r = r+dr

NEXT

// Top lid

IF topRadius>0

X_OBJNEWGROUP

X_OBJADDVERTEX x2*r, y2*r, height, x2/2+.5, y2/2+.5, col

X_OBJADDVERTEX x1*r, y1*r, height, x1/2+.5, y1/2+.5, col

X_OBJADDVERTEX 0, 0, height, .5, .5, col

ENDIF

X_OBJNEWGROUP

NEXT

X_OBJEND

ENDFUNCTION