IES-VE User Forum

I have used IES being a student for quite a few years but only recently attempted to create buildings from scratch, every building I create every single room has unmatched adjacencies, what am I doing wrong ?

I would expect you are not aligning your room endpoints properly. Make sure you have the grid snap lock on and you don't have too fine a grid (for starting try setting to 0.5 or similar). If you are tracing a DXF then it is likely you could be snapping to DXF and missing the model endpoints of existing rooms or missing grid points.

Unmatched adjacency means you have a slight mismatch in two rooms that recognise they are adjacent but may see slightly different adjacency area on each side due to small misalignment.

Important to practise now and avoid these pitfalls because if you don't have a good robust geometry then you will find many errors and potentially inaccurate results come analysis time.

These are good practise points but maybe some others here can share your own experiences and how you draw geometry to ensure a good quality model?

Phil

Thanks Phil,

I've read through the majority of topics on the forums and managed to create a complete building without any geometry problems, from my little experience and from the knowledge i have from other topics it seem's keeping within the grid instead of snapping to dxf is one of the best solutions to avoid problems with geometry. Although this does lead to slight area differences the model has no issues, is this how most others would approach models when drawing from DXF's ?

Any other comments will be highly appreciated

Regards

Stuart

That's a good question Phil.

I find the safest way to draw geometry is to set a grid of about 0.05x0.05 and then only snap to grid and model end points. If you stick to this religiously then you are likely to have very few geometry errors. However, this method requires a bit of simplification of your model and a slight drop in accuracy as well as producing a rather bumpy facade, especially if you have to move off of an orthogonal axis.

A more advanced way that allows for a much "neater" model would be to go off grid and set the model end point, nearest point, parallel and perpendiculat snaps and then ensure every wall is lined up that way. This method takes a lot more skill, especially with the use of construction lines, and is high risk in terms of geometry errors but it does allow for high precision and beautifully straight facade lines.

HI,

I havent used IES for building models in several months, only chekcing others work.
I has been building away using a grid at 0.1 x 0.1 and sticking to the grid and model end point locks. However the building I have as a lot of walls that run at angles, meaning that the in some cases when I go to draw a zone beside a zone which has a long angular wall, I cannot pick up a grid point without leaving a small gap or intersecting the next zone. The other adjacent wall is on the grid at both ends but inbeteen its is slightly off. I dont wnat to pick nearest points as I know it will end up with non planer spaces which are not good! I know there is a way round this, but I cannot remember! Hope that all makes sense.

Can anyone help?

Hi mcj

The only way to deal with this while sticking to grid is to ensure that you create a vertex on the adjacent wall at the point you will need it later. In other words, you have to click as you go past the intersection point when drawing the adjacent wall.

This can take a quite a while to get used to and can lead to some frustrating restarts but it is worth it in the end.

CP

Cheers for the info, cruising now, much appreciated.

Just a couple of extra thoughts. I tend to use SketchUp now so my ModelIT is a bit rusty.

When I used to work on really complex buildings with lots of angles and circular facades etc. I would use AutoCAD to create a very simple, single line DXF for the zones and then just trace it in IES.


Another option on some buildings is to draw everything orthogonally using the grid. Then rotate the pieces and put them together at the end.

Sounds like you are already on top of this though.