Patrick Fritsch Posted June 9, 2012 Share Posted June 9, 2012 (edited) Maybe someone could guide me? I'm trying to figure out the best practice to position a Bldg on a DTM. I've set the X,Y tentative position easily in top plan view but my problem is to set it at the proper Z elevation. I'm trying to design the bldg in function of the natural site slopes which is pretty steep so I don't want to use any site pad modifiers just yet that will create a flat spot on the DTM at the bldg perimeter. The other part of the difficulty is how to draw the stepped footing that follows the DTM grade while ensuring that I maintain the minimum frost protection of 3ft to underside of footing, there is a whole lot of lines to look throught the elev views of the DTM. Any suggestion much appreciated. Edited June 9, 2012 by Fritsch Quote Link to comment
Dieter @ DWorks Posted June 11, 2012 Share Posted June 11, 2012 You could create temporarely section viewports to get what you want to know. There is also a command that gives you the dtm profile over a path, but I don't know the name. Quote Link to comment
bcd Posted June 13, 2012 Share Posted June 13, 2012 Create Contours perhaps in the 3d Modeling Toolset Quote Link to comment
CipesDesign Posted June 13, 2012 Share Posted June 13, 2012 Patrick, I would start by thinking about how we used to do this, before computers. We would draw many sections and from those find the closest approximate 'point on grade' at each footing, foundation, etc. Then we would interpolate from one section to the next. In VW's I would approach this problem in a very similar way. Placing the building at the correct Z height (or elevation) is fairly easy. If you know the approximate elevation, just set the Layer Z value to that number and draw a couple walls or extrudes, then cut a section or two to verify, or view in 3d to check... Then adjust the Layer Z values as needed to tweak it just so... Also, I use Site Modifiers all the time and find them VERY useful for this type of work. P Quote Link to comment
Patrick Fritsch Posted June 13, 2012 Author Share Posted June 13, 2012 (edited) I started doing exactly as you say Peter, first a rough bldg elevation position then a section viewport at every bldg face to check ground cover of my foundations...At least I don't have to extrapolate the grade section profile like I've done on a drafting table many times before! I was kind of hoping the software could figure out the fndt stepping for me, I guess the BIM DTM/Fndt walls is not smart enough yet! Edited June 13, 2012 by Fritsch Quote Link to comment
CipesDesign Posted June 13, 2012 Share Posted June 13, 2012 I do seem to remember a feature which allowed the fitting of a retaining (or foundation?) wall to the DTM, but I can't seem to recall what or where it is at the moment. I will continue to look and post back if I find it! Quote Link to comment
Kizza Posted June 19, 2012 Share Posted June 19, 2012 (edited) I've set the X,Y tentative position easily in top plan view but my problem is to set it at the proper Z elevation. Modify>Move>Move 3D? Then enter Z offset. Edited June 19, 2012 by Kizza Quote Link to comment
Kizza Posted June 19, 2012 Share Posted June 19, 2012 You could create temporarely section viewports to get what you want to know. There is also a command that gives you the dtm profile over a path, but I don't know the name. AEC>Terrain>Site Model Section? Quote Link to comment
VincentCuclair Posted June 19, 2012 Share Posted June 19, 2012 You could create temporarely section viewports to get what you want to know. We would draw many sections and from those find the closest approximate 'point on grade' at each footing, foundation, etc. Then we would interpolate from one section to the next. In VW's I would approach this problem in a very similar way. In relation to this and with 3D modeling in general in mind, the need for live sections is painfully obvious.......just being able to select and edit slab/wall/window etc. OIP info through section VPs would be a huge asset..... Quote Link to comment
bcd Posted June 21, 2012 Share Posted June 21, 2012 Duplicate a 3d locus along the path of the perimeter & move a point to each corner Select all loci Send to surface. Move 3d z= -3' These will represent the min depth for an undisturbed terrain. Cycle through each 3d locus on in the OIP and drop adjacent loci below this plane to reduce the number of steps Use 3d loci to create 3d polygons on a new layer for each of the step levels Select foundation walls & Fit to Roof constraining the bottoms to the 3d polygon layer. & underpin the walls Quote Link to comment
bcd Posted June 21, 2012 Share Posted June 21, 2012 Lo and Lo! Send to surface also works with walls. Providing an instant trace of the surface along the lie of the wall. Editing the wall in Elevation should then prove extremely useful in achieving this. Quote Link to comment
Patrick Fritsch Posted June 21, 2012 Author Share Posted June 21, 2012 Brian now your talkin' my language...i'll give this workflow a go. Quote Link to comment
bcd Posted June 21, 2012 Share Posted June 21, 2012 Canadian's my cousin toungue! Quote Link to comment
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