Watch this space for full details of the updates, the improvements and how-to’s !
Existing users should contact us now for update details.
TheoLt, TheoLt Contour and TheoLt Tools now improve the productivity of BricsCAD to V17 and AutoCAD to Release 2017 for anyone using Total Station, Laser Distance Meters or Laser Scan Data for the productions of plans or elevations.
One of the most frequently asked questions by TheoLt users is:
‘How do I get an elevation view of the building I’m measuring?’
TheoLt sends 3D data to AutoCAD which is plotted in the lines and layers of your choice. It is useful to be able to vew the drawing as a façade. One method to achieve this is to use AutoCAD’s UCS (User Co-ordinate System) command to set up a façade UCS and view it square on. The 2 key commands are ‘UCS’ and ‘PLAN’. This example is a job started in WCS:
1. Place a polyline across the plan by snapping to the ends of a measured line (because this will guarantee the UCS will be true level) It’s the red line across the facade here:
2. Fix a UCS to the polyline. Use the UCS ‘e’ option (for ‘entity’ or ‘ob’ for object in late versions) to pick the polyline when prompted. Use ‘Plan’ to get a plan view of the new UCS.
3. Rotate the UCS about the required axis by 90 deg to point the Z axis at the viewer of the façade. This is done by entering ‘UCS’ on the command line and then the axis of roatation (x, y or z) then the angle, the default is 90deg. Watch the UCS icon to see what is happening.
4. Use ‘plan’ to get a plan view of the new UCS
5. (optional) Use UCSICON command to set ‘Noorigin’ to get the icon out of the way..
6.Save the UCSwith an apropriate name (‘Front’ ‘Back’ North ‘Elavation’ etc) with the ‘S’ option at the UCS command for future use.
Enjoy your facade view!
TheoLt will plot lines true to the instrument orientation in AutoCAD regardless of the UCS. View-ports in model space can be used to run plan and elevation drawings at the same time. The façade UCS is also useful when setting up views of the 3D data for elevation drawings.
You can also use the AutoCAD ‘View’ command to save views too as a short cut to getting back to a view you like. Once the façade view is as desired it can be named for future use.
Tip: I find it helps to use your hand in the same way as we did to learn Flemmings Left hand rule (assuming you have your mouse in your right hand!) in physics at school to work out the required axis of rotation at 3:
This is a useful method of setting up a facade UCS if your job isn’t aligned to the WCS : don’t forget TheoLt’s Default Orienation option to orient aligned with a plane which is great for quick starts aligned to a facade.
One of the great advantages of TheoLt compared to other survey software is it’s complete flexibility. For example, lets take a look at the “Features Library”.
The basic premise of TheoLt is that it transfers the measurement information or point from a survey instrument (or Distance Meter) to CAD to be used by any command (for example, draw lines, insert blocks etc). What the TheoLt Features Library enables is for a series of measurements to be combined to insert a series of lines, arcs or attributed blocks (much like standard survey “feature coding”).
The feature definitions are accessed through the the settings dialog in the main TheoLt window. Definitions are grouped into folders.
Looking at it’s simplest use, inserting a single attributed block as a detail point. The first stage is to name the feature , define it’s icon and the number of measurements that should be taken to insert the feature. In this case, a single 3D measurement.
The next stage is to define any user attributes that may be required and whether confirmation is required (asking the user to confirm the values). Finally select the block to be inserted.
Once defined, opening the features panel will show the newly created item and a single click on the apropraite icon in the feature palette will prompt for the measurement and the block will be inserted.
Next we can look at a more complex but typical use; kerbs tops and bottom in topographic survey. The aim here is to pick points on the top and the bottom of the kerbs, connecting the points, inserting blocks and annotating levels. This is very typical of topographic survey. Our definition will be point on top of kerb, point on bottom of kerb before moving on to the next part of the kerb.
Defining the feature, we name it and use 2 3D measurements with correct prompts. As we wish to join the points with lines, we will select “repeat insert” and join points on Layer (each point type having it’s own layer). This will allow the lines to be continued for as many measurements as required before exiting the command. The attributes will be the Z-level of the first point only and two blocks will be inserted, each on it’s own layer.
Now when selecting the feature from the palate, the measurements are prompted, blocks are inserted and then the first prompt starts again. After the next round of observations, lines are drawn between the respective points on their designated layers. Options allow the lines to be curved, straight and the alignment of the annotation to be altered or disabled.
The final example is a single complex item; a tree. To measure one fully quite a few measurements are required; the centre of the main trunk, the girth of the trunk, horizontal extent of the canopy and finally the vertical extent (height). These can be defined in the first window with prompts and measurement types. I would assume that for the first measurement the operator would take the angle to the centre of the trunk before taking the distance to the centre. This would leave the instrument pointing to the extent of the girth which we can collect as an angle only measurement. We can also choose to write the details out to a file which can contain any of the collected data fields for processing.
Next we will create the attributes where we will also collect the tree type which will be stored in a list to speed up the user input.
Finally we insert a block to represent the trunk – scaled to match the girth. A second block will be inserted, scaled to math the canopy. An attributed block is inserted to hold the details of the tree (in addition to the file written above).
Obviously, this is not an in-depth analysis of what is possible from the features palate but I hope it gives some indication of the power within TheoLt.
This week I spent two wonderful days as a guest of CADW working at Chepstow Castle.
CADW site listing and…History of the Castle
The castle is a gem, and it was a privilege to be shown some of its secrets by the conservation experts I was working with. We had awful weather but we didn’t mind, as working together, we were able to get a good plan of the 2nd floor of Martens tower and, for me at any rate, this is the finest kind of work there is!
The Architects Dept. of the national heritage body for Wales need surveys for site conservation and development. Following a demonstration at the Digital Past event in Cardiff earlier in the year the Architectural Technicians Team bought TheoLt Pro to work with their Leica 1200 series instrument.
I agreed to supply 2 days of ‘on demand’ training for Paul Hayes, Michael Hopkins and Tony Kinson who handle a variety of challenging projects which need critical survey information in real-time.
Survey is a key tool in site development of any kind, and heritage sites have very specific survey needs. The CADW team get most of their survey done by contract survey companies working under a framework agreement, but there is a constant need to get small tricky areas surveyed quickly to kick off a design scheme for new visitor accommodation such as ticket offices, access pathways and the like. Surveys need to be quick, in CAD, and annotated with levels in plan section and elevation.
The training session began with a quick assessment of training need and moved straight into practical procedures: getting a quick survey started using default orientation is a very useful way of getting the most out of limited site time, and the TheoLt ‘Default orientation’ option proved the point- once the kit is set up you can begin collecting precise 3D wire frame in minutes!
Its worth remembering TheoLt was designed for just this kind of scenario; a CAD plot of a single wall profile can make all the difference in project design and the software puts the absolute minimum between the surveyor and the CAD drawing. The CADW team are focused on solving project information needs and were impressed with the direct to DWG approach.
Working as training and support for Latimer CAD I find building a good relationship with TheoLt users rewarding and fun: its great to know CADW are able to get the most out of their 1200 now they can work with TheoLt!
We quickly worked through our training agenda:
Getting to know the ‘most wanted’ AutoCAD commands in surveying turned out to take up almost as much of our time as getting to know the TheoLt interface, this was no surprise to me as I know when TheoLt is used well it’s virtually invisible, making the job an AutoCAD one rather than a surveying one!
CADW need sections, levels and plans of the ‘hard to reach’ parts of their monuments and sites and this is just where the flexibility of TheoLt is an asset to the CADW team. At the very beginning of our session I was told the frequency of survey activity in the workgroup was very variable and they needed a method that is simple enough to pick up months after last use. By the time we packed up at the close of the session I was cheered to hear user comment like ‘this is so much better that what we did before; you can see your mistakes as you make them!’
Driving home along the banks of the River Severn I was reminded of my first days doing CAD surveys and how often I would get stuck and have no help at all ( it was ‘PenMap’ in those days) and I look forward to the CADW teams first site survey with TheoLt because, of course, I’ll be there if needed to build the skills required; I have opened the door of opportunity for these surveyors and I am proud to have been invited to do so!
