I am wondering if it is possible to use the perpendicular snap somehow to
draw one line perpendicular to a base line from a specific point. I am
usually doing this when I lay out curves for a road. I know my pc or pt
point and want my line to be perpendicular from this point. Any help will
D.T. Collins & Associates
1042 Mechem Drive
Ruidoso, NM 88345
PERP is a TO selection option, not a FROM selection option: rotating your
crosshairs to match the angle you want to start from using SNAPANG command
and turning ORTHO on gives you the 90degree effect you seek instead.
Add-on products for LT
If you draw in this order the following will work. It does not use eh Perp
Draw the tangent coming into the curve. After drawing that line start the
arc command. When is asks for start point. You will now be drawing an arc
tangent to the line you just drew.
After drawing the arc start a Line command. At start point hit enter. You
will now be drawing a line tangent to the arc.
The commands must follow one after the other. If you do anything in between
you will not be able to pick up where you left off.
If the line work is already created and want to create a line tangent to the
PC or PT you can draw a line from the point to the center of the arc. Or you
can use Grips with copy & rotate to rotate a copy of the tangent @ 90D.
You could always buy LDD/Civil 3D. Commands to accomplish this and many
other facets of road design are included.
"Darryl Collins" wrote in message
>I am wondering if it is possible to use the perpendicular snap somehow to
>draw one line perpendicular to a base line from a specific point. I am
>usually doing this when I lay out curves for a road. I know my pc or pt
>point and want my line to be perpendicular from this point. Any help will
> Dennis Rich
> D.T. Collins & Associates
> 1042 Mechem Drive
> Ruidoso, NM 88345
> (505) 258-5272
I was speaking to your comment that PERP was NOT a FROM option, which it
clearly is. The OP wishes a double osnap, perp AND endp. I doubt that is
possible in any case.
"Dean Saadallah" wrote in message
> Re-read the OP for the specific instance, not a blanket tangent discussion
> on perp usage.
> Dean Saadallah
> Add-on products for LT
<<>>>I doubt that is possible in any case...<<<
Exactly my point, OP specific response >>
That may have been your point, but your statement that "PERP is not a FROM selection", was in error. The OP is requesting a double osnap (perp AND endp), which is not available for ANY combination of osnaps.