Truss to RISA
Mark — Example model (replace with your drawing)Generate a truss from a template
Sizes and end conditions come from the defaults in Settings.
Drawing
Drop a truss drawing or click to choose
PNG, JPG or PDF. Shop drawings, details or photos. Add a key plan as a second file.
PNG, JPG or PDF. Shop drawings, details or photos. Add a key plan as a second file.
PDF page
Straighten to a true elevation
Drag the four numbered pins onto four points of the truss plane, then give their real positions. The photo is flattened so the truss reads at one scale, as if seen straight on.
Pin 1 left bearing, pin 2 right bearing (both on the bottom chord line), pin 3 above the right bearing and pin 4 above the left bearing, at the height you enter. For a pitched truss, use the end verticals or heels if it has them; otherwise use "Four joints".
Preview
Upload a drawing, crop to the truss if the sheet is busy, then have Claude read it. You check and correct everything before export.
Notes from the drawing
Analytical model
Top chordBottom chord
WebVertical
○ pinned end▲ pin support · ▲○ roller① check to fix (click for details)
Set size for all
Editing a size or end condition marks that member fixed, so bulk changes and re-reads leave it alone.
Coordinates in feet. Type 12.5, 12'-6" or 150" — all mean the same thing. Origin is the left bearing at the bottom chord line. Restraints: — free, R reaction, F fixed (held, no reaction reported). Picking a Support type fills them in; edit any one to make that node custom.
Comes as a .zip (the viewer only allows standard file types). Unzip it and double-click the .r3d.
What goes into the .r3d
.r3d text (downloads are off in this view; copy it into a file named truss.r3d)