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Thread: Topography (Yeah, Yeah)

  1. #1
    Senior Member Tim West's Avatar
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    Cool Topography (Yeah, Yeah)

    I thought I should share this thread with you lot as I did a little dance when I stumbled onto it (If you already know this one, sit back with your pop corn and fill in any gaps....).

    Creating pleasant batters in Revit topography.
    Preamble.... Ever tried to make the land around your building pad flow gently down to harmoniously meet the correct level only to find jagged surfaces and 'zigzagging'. Well now your woes are over. But wait, send no money now, it's easy and free for a limited time.... (yes it is past bedtime)

    1. In a plan view, mark out the area you wish to be flat (or evenly sloped with a minor tweak to the method) with model lines, ensure that they are a continuous chain for speed sake.

    2. Use the 'split surface' tool and 'tab highlight chain' with the 'pick' tool and click to select the pad outline and 'finish' to split off the pad.

    3. Use the 'split surface' tool on the remaining (outside the pad) surface and 'tab highlight chain' with the 'pick' tool with an offset of your desired batter distance (if it is steep terrain and you require a minimum grade you may want to manually draw these lines) and click to select the pad outline and finish to split off the batter.

    You should now have 3 different surfaces, the building platform, the batter and the remainder...

    4. Edit the building pad portion of your surface and delete any internal points then finish. Do the same with the batter portion being diligent to not delete ANY of the edge points.

    I have tried for a few years placing points manually (0mm relative to surface) to make this work with mixed results. If you use the split surface tool, points are generated along the split lines based on the triangulation edges that define the surface and generate contours

    5. Use the 'merge surfaces' tool to join the building pad and the batter sections of topography together. Ensure that the 'remove points on common edges' is unchecked.

    6. Edit the newly joined toposurface. You will find a trail of points along the line of the recent join. select all these points and change their height to the desired level. If you require a slope to your pad, switch to the predefined elevation/section and 'rotate' the points to your desired slope, before losing selection. Finish the surface.

    7. Use 'merge surfaces' to combine the two remaining surfaces, again ensure that the 'remove points on common edges' is unchecked.. The result is an accurate batter between the original topography and the desired pad.

    If you create a building pad with the 'building pad' tool and cut sections, you will find that the surface is pretty damned accurate, almost indistinguishable in 3D

    I do hope that this isn't too old a method as I was kinda proud to find it!

    Peace and bedtime....
    Last edited by Tim West; March 9th, 2011 at 11:32 AM. Reason: Tired Typos

  2. #2
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    mdradvies's Avatar
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    Bookmarked and repped! Great post, sites always seem to do what they please for me. Exception being the import from file tool, but when I try to create manually it always becomes a big mess... So this is very very helpful!

  3. #3
    Senior Member Tim West's Avatar
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    Another odd observation I noticed when playing with toposurfaces.

    When merging topo's, Revit will often throw an error 'surfaces not interracting, must overlap or share common boundary' (or something) even when edges do interract. Apart from crashing (Autodesk are now aware of several real topo bugs) there is the disappearing topo problem and the spot elevation breakages....

    If you are having trouble joining multiple surfaces (or if you have made some surfaces that don't interract, you can 'join' them by creating an intermediate surface. If you create a surface using points of the same elevation, 3 will do, you will get a flat surface right? make this over lap the surfaces you intent to join. using the merge surface tool, you can merge each surface with the intermediate one (ensure 'remove edge points' is unchecked) then delete the 3 initial points. Be aware that if the 3 (or more) points are the only ones making the edge, deleting them will result in the surface disappearing in a cloud of errors. Just make sure that the points are 'inside' the boundaries of the joining surfaces...

    I do hope that makes at least a little sense... and be careful to save before a merging session as Revit can kick and scream when joining surfaces....

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    Forum Addict elton williams's Avatar
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    Thanks Tim! great post

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    Member JeffreyMcGrew's Avatar
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    I've found that it's always a good idea to split topos up into smaller chunks for editing anyways. Way more stable and way faster, and you can just merge them back together after.

    As long as you don't have a bunch of subregions I'd recommend always breaking the topo into smaller chunks. I usually do so along property lines and roads and such...

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    Cool - is it poosible to use this method to create a batter to a pad?

    Thanks,
    J

  7. #7
    Senior Member Tim West's Avatar
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    jh75,

    I have used a pad to test the accuracy of this method and have found that the accuracy seems to be within 10mm (less than thin lines at 1:50) so probably suitable.

    If you need a specific slope/ratio for your batter, you can create a Ramp/roof or similar sloped element, starting along the edge of your pad and draw your 'Cut' line along the intersection of this element and the topography (Autodesk should really make a simple tool to do this...) and use that...

    Peace

  8. #8
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    I trie this method on a project the other day and it was wotking very well - even though I couldn't join/merge the surfaces afterwards. But as for representation it was neat.

    Cheers,
    J

  9. #9
    Senior Member Tim West's Avatar
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    I'm glad it was of use. I am surprised that the surfaces do not join. There are some serious bugs in Revit topography, especially when joining surfaces with common edges, though I haven't encountered then when joining soon after splitting... Maybe another bug request is in order, would you like to submit one, so it isn't always me harping on about broken topos!

    Peace

  10. #10
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    I posted about another, more involved method at http://whatrevitwants.blogspot.com/2...ints-2011.html
    Attached Files Attached Files

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