alfresco Posted April 16, 2009 Share Posted April 16, 2009 I have created a site model for a patio detail. The site model has elevation station ponts. I would like to excavated a volume of material which is unsuitable for the base. I will bring in an aggragate road base for a suitable base material. I have used the grader tool and set the elevations but am unable to produce a cut volume. How can I calculate a cut volume? Thanks. Quote Link to comment
islandmon Posted April 16, 2009 Share Posted April 16, 2009 Cut&Fill compares the Existing & New DTM Models and then does the subtraction and/or addition section by section to produce the calculations of volume. Basically, you need to have the Existing DTM one one Layer and point to the New DTM on a separate Layer prior to running the routine. Quote Link to comment
alfresco Posted April 16, 2009 Author Share Posted April 16, 2009 Thank yuou vey much for your help. If I am to understand you correctly I need two DTM's. Each on a seperate Layer? I am not sure how I point to the New DTM to run the program? How are the DTM's linked? I understand the rationale, but am not sure regardings the process? Can you clarify. Thanks again. Quote Link to comment
Ozzie Posted April 16, 2009 Share Posted April 16, 2009 Islandmon, are you sure they have to be on seperate layers? I thought proposed and existing DTMs were contained within the Site Model Tool In the Object Info Palette make sure when you use Site Modifiers they are acting on the proposed DTM So create your site model then modify it with pads. the grader tool - read up in Help about Pads, Fences etc - You then should have two site models - existing and proposed and the volumes should calculate The DTM is an amazing tool but it needs a good rebuild - I am hoping for that Quote Link to comment
alfresco Posted April 17, 2009 Author Share Posted April 17, 2009 Thank you very much for your suggestions and assistance. Is the initial DTM produced using the existing elevations/data and the DTM using the Modifier proposed? I would like to excavate and back fill with an approiriate material. I thought that I would be constuctring a textured bed for the paver patio application. Is this correct? Thanks. Quote Link to comment
Ozzie Posted April 18, 2009 Share Posted April 18, 2009 Existing DTM from you initial input Proposed from Site Modifiers - make sure you have that right in the Object Info Pallet - I think it says Apply To and you choose Exiting or Proposed Sorry I do not have VW open You can use a Texture Bed and I think but am not sure also you can use the Hardscape Tool - never tried it If you need to you can select the Site Model - right click/Edit and change your original source data Also after most things you do you have to Update the Site Model - so keep updating it Good Luck Quote Link to comment
islandmon Posted April 18, 2009 Share Posted April 18, 2009 By habit I always keep the Existing DTM on a separate C-Exst-Layer and the new proposed on C-New-Layer. This way the originating data is always separate from the efforts to modify it. That's how the DTM Procedure was originally set-up. Two different symbols on 2 different Layers. Quote Link to comment
dspearman Posted April 18, 2009 Share Posted April 18, 2009 (edited) Some versions back the DTM underwent a metamorphosis and became the "Site Model Object". This object contains both the existing and the proposed DTM (or Site Model as it is now known). It also contains the source data. So, if you are using a recent version (and you are alfresco - 2008), you can't keep the existing and the proposed on different layers because they are the same object. You do have the option of creating a 'SnapShot' of the Site Model and placing it on a separate layer but this is unrelated to the Cut and Fill calculations and you shouldn't think of the Snapshot as being a different Site Model - as it remains linked to the originating Site Model. It's more like a design layer viewport for Site Models although it as some added capabilities and limitations. With Vw 2009 Site modifiers (such as pads) gained the option of affecting the 'existing' portion of the Site Model. This is a setting in the modifier and you set it using the Object Info Pallet. It will affect the result of a cut and fill as ... if the modifiers are all modifying the 'existing' then there will be no cut and fill. Alfresco is using 2008 so he won't see this. Also with 2009 the cut and fill calculation got a lot more accurate at the expense of speed. With 2009 instead of being calculated everytime the Site Model was updated, it calculates only when the 'Calculate Cut & Fill' Button on the Object Info Pallet is clicked. (Be aware that you have to have the site model selected to see this option. ) Again in 2008 alfresco won't see this. islandmon - you are correct that 'That's how the DTM Procedure was originally set up." but ... it doesn't work that way anymore and hasn't for some time, so if alfredo is using 2008 like he says this doesn't apply. I should also add alfresco, that if you do create two site models - you won't get a cut and fill because to calculate it the site model needs to have both the existing and proposed in the same object. So create an existing site model, add pads and modifiers, update it and you should see a cut and fill, regardless of whether the actual site model is displaying the existing or the proposed... Edited April 18, 2009 by dspearman Quote Link to comment
Ozzie Posted April 18, 2009 Share Posted April 18, 2009 dspearman - agree with all of that The Site Model Tool enters very complex territory but is also very powerful - on a recent prject it amazed me what it can achieve I created one Site Model - Existing and then another Proposed to consider some cut volumes for batters and road levels which had to be considered as Civil Work Expenses. From the Proposed I extracted data; created a new Site Model - New Existing - and then used all of my proposed landscaping levels - New Proposed (final Landscaping) to gain cut volumes for landscaping works It worked and worked well but is was painstaking We have options when creating a Site Model to get rid of original data (I needed that for documentation purposes) or to gain data from the Site Models Layer or all Layers (my existing Data I Classed and put on a different Layer and told the site Model / Models to live on their own seperate layer / layers Whilst it all worked and amazed me what could be achieved the Site Model Tool really needs to be made into a much more intuitive and user freindly Tool Later with 3D Mesh boulders, Texture Pads, Image Prop trees I produced a rendered 3D model of the finished landscape - a recreation reserve All the way through the project I exchanged my data with the engineers Proved to me that persisting with VW leads to being able to achieve great things The Site Model Tool combined with roads, and other tools can do with some really clever software development Quote Link to comment
dspearman Posted April 19, 2009 Share Posted April 19, 2009 Hi Ozzie, You might consider next time to create one site model and have a 'snap shot' to show the existing. It's simpler and you don't get the annoying dialog asking where site model a stake should apply to. I find things go much smoother for me if I limit myself to one site model in a file. If you really need two site models keep them in separate files and use design layer view ports to reference them to a third. Quote Link to comment
alfresco Posted April 20, 2009 Author Share Posted April 20, 2009 Thank you all very much for your input. The information is very helpful and I greatly appreciate your support! I will revisit the DTM with your comments in mind. Quote Link to comment
Ozzie Posted April 20, 2009 Share Posted April 20, 2009 Hi dspearman, No problems with having two site models or more on seperate layers in the one file as long as if you need to each is isolated to its own layer I do all of that but tend to use seperate files DLVPs all of that as required Quote Link to comment
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