LITIO is a sheet metal fabrication program that calculates flat (unfolded) sheet development of ducts rectangle to round transitions cylinders cones pipe intersections connections bifurcations elbows etc. For HVAC hoppers cyclones dust extraction ducts conveying systems silos piping etc. To draw your sheet metal developments directly in AutoCAD R2000 and later (2019) GStarCAD BricsCAD & ZWCAD (no need to DXF importexport).For sheet metal fabrication: roll bend and fold your patterns.Steps of use: First select the 3D surface you want to unfold. (You can select: either inside outside or mid cross sectional dimensions andor height specifications to draw or not the 3D surface and the unfolded sheet as a mesh to help you when bending the sheet or as 2D contour to ease cutting the precision of the calculation of the developments).Metric UnitsImperial units: the program automatically sets the units according to the units used in the current drawing session.After finishing the input of parameters the program draws the 3D object and the respective development.Afterwards you can use the 2D developments for NC CAM cutting (plasma laser etc.) or manual cutting by plotting them 1 to 1 (1 d.u. 1 mm or 1 d.u. 1 inch) on paper and using these templates to mark the metal sheet and cut it.Check the right download file for your CAD system. Go to http:www.litio.sidownload.htmThere are LITIO software versions available for:* AutoCAD R2000 and later (2019) no LT no Academic* GStarCAD* BricsCAD v.11 and higher (either Classic Pro andor Platinum). It does not need BricsCADs Sheet metal module. &* ZWCAD ZWCad v.2017 and higher. It does not need ZW3D..