2d profile of rafter

[Anonymous]

i want an x to appear inside the contour of a rafter in section view. i tried the plane command, but that only worked for floor joists as they are horizontal. i've been trying to use the tube command...but i don't really understand it. needs to be something that allows me to put two intersecting planes at the same angle as the roof

[Anonymous]

I don't think you need the TUBE command to do what you want.
Which command are you using for the rafter object ?
What method are you using to pitch the rafter object ?
Thank you,
Peter Devlin

[Anonymous]

if gs_detlevel_3d=0 then end

PEN gs_cont_pen
MATERIAL roof_mat


ALPHA=ABS(ATN(COS(G)*TAN(P)))
M=A*TAN(ALPHA)
N=H/COS(ALPHA)
T=T/2
U=T/SIN(G)
W=W/2
D=ABS(90-G)
S=W/COS(D)

IF G<0 THEN V=0 ELSE V=1
IF G>90 THEN V2=0 ELSE V2=1



unID=1
HOTSPOT 0,-B/4,(H/2)/(cos(ALPHA))-(A/2*tan(ALPHA)),unID=unID+1 !! Hotspots in axis
HOTSPOT A/2,-B/4,(H/2)/(cos(ALPHA)),unID=unID+1

HOTSPOT U,0,-A*tan(ALPHA)+U*tan(ALPHA),unID=unID+1 !! lower Hotspots
HOTSPOT A-S,0,-S*tan(ALPHA),unID=unID+1

HOTSPOT U,0,-A*tan(ALPHA)+U*tan(ALPHA)+H/2/(cos(ALPHA)),unID=unID+1 !! middle Hotspots
HOTSPOT A-S,0,-S*tan(ALPHA)+H/2/(cos(ALPHA)),unID=unID+1

HOTSPOT U,0,-A*tan(ALPHA)+U*tan(ALPHA)+H/(cos(ALPHA)),unID=unID+1 !! upper Hotspots
HOTSPOT A-S,0,-S*tan(ALPHA)+H/(cos(ALPHA)),unID=unID+1




ADDZ -M
ROTX 90

ADDX U

ROTY G

CUTPLANE 1, 1, 0, V !Cut at the Bottom1
DEL 2

IF G<90 THEN GOSUB 1 ELSE GOSUB 2


ADDX A-S
ROTY G

CUTPLANE 1, 1, 0 !Cut at the top1
DEL 2

ADDX A-S
ROTY G-90

CUTPLANE 1, 1, 0, V2 !Cut at the top2
DEL 2
ADDZ -B/2
PRISM 5, B,
0, 0,
A, M,
A, M+N,
0, N,
0, 0


CUTEND
CUTEND
CUTEND
CUTEND

plane 4, 0.006,0,0,0.006,-b/2,h,a-.006,-b/2,h,a-.006,0,0
plane 4, 0.006,0,h,0.006,-b/2,0,a-.006,-b/2,0,a-.006,0,h

DEL TOP
END




1:

ADDX U
ROTY G+90
CUTPLANE 1, 1, 0, V !Cut at the Bottom2
DEL 2
RETURN

2:

ADDX U
ROTY G-90
CUTPLANE 1, 1, 0, V !Cut at the Bottom2
DEL 2
RETURN



so that's the code right now. p is an angle type variable that the tells the rafter what pitch the roof is and i only see it mentioned once in the alpha equation up at the top. you can see where i slapped the plane command in there.

[Anonymous]

I don't see where you rotate the PLANE commands in the same way
you rotate the PRISM_ command. It seems to me you need to do this.
I have an object that displays these crossed lines in section and
it uses the POLY_ command so I don't have to worry about it
being planer as one does using the PLANE command.
Peter Devlin

[Anonymous]

where is the rotate command for the prism in there?

[Anonymous]

You are right. There is no ROT command.
I am unable to understand your code because
I do not know what all of the parameters and
variables are. The variable/parameter "H" for example.
It does me no good to copy your code into a new
object to see how it works because of this.
Peter Devlin

[Anonymous]

i looked in the other script windows but didn't see any rot commands. yesterday i tried roty p and thought it would match the roof slope but the angle wasn't right. the only thing right was that it was rotating around the right axis. i thought maybe the g variable would have some kind of affect on it since that is the angle the rafter rests against the ridge. but i can't seem to wright the right script. you mentioned poly_. if i were to use that here instead would i have use the rot command along with it?

[Anonymous]

For the reasons I mentioned, I can't understand your code
so I am unable to answer your questions.
I am guessing that the reason why ROT p did not work
was that the local origin of the beam element was at
the underside beginning and not at the top side beginning.

What I can do, if you like, is send you the object that
I wrote that works and does what you want.
You can study the code and see how the crossed lines
are coded. This object is somewhat complicated because
I wanted it to have seat cuts and plumb miter angles etc.
You can ignore all that and just see how the beam and
the cross lines are coded.
Peter Devlin

[Anonymous]

i would appreciate it. thank you

[Anonymous]

Please post your e-mail address or e-mail me
with your address so I can send you the library part.
My e-mail address is in my signature.
Peter Devlin