Hello Everyone,
I have been implementing many line control codes and I would really like to see a line control code that both spirals into the adjacent straight lines as well as generate a smooth curve which travels throughout the points along the curved line. As of now, it inconvenient to use the "tangential arc" "non-tangential arc", and "smooth curve" line control codes to generate what I want. Is there any convenient solution TBC can offer? Thank you! line control codes
Robert,
I know this is old, but you might be able to help me.
I am trying to process feature codes then export them to a .dwg file. When I process any type of curve and export the linework from TBC to a .dwg file the result are 2d polylines (which are fine). If I then explode these polylines the curved lines are not curves, they are short straight line segments. Is there any way to get a curve to export out of TBC?
Thanks,
Todd
This sounds familiar, there might have been something mentioned on the December TBC power hour relative to this. I made notes about it but looks like I threw them away. Maybe someone that saw it will chime in.
You were correct. This was addressed at 23 minutes into the video. The question that was asked was, "I've got linework in TBC and want to export it to CAD. How do you export a curve to a .dwg without it creating a lot of vertices?"
Their answer was to change the "Breakline Approximation Paramaters" under "Project Settings - Computations - Surface" to 0.001m. The only problem is this did not answer the question, it only made it worse. By doing this you have now created more vertices and you still do not have curve.
Hi, I've been able to get a series of arcs, I'm not seeing small straight segments. How are you creating your curve in the first place?
Is it a bog standard curve created from control codes? see my response to your other question. I'd like to see if I can replicate this.
I am using line control codes. It seems that as long as all the elevations in the set are the same elevation you will get curves. If the points that are used to generate the linework have different elevations TBC generates short line segements to approximate the curve.
This is the link to the tutorial from Trimble. If you run through this you will see that once the file is processed using feature codes and exported to CAD the curves are all line segments and not curve.
Can you show more points than what you did, to see what's going on before and after your curve?
My experience with different cad software over the years, is located curves are always finicky. Sometimes the curve in the field isn't a simple curve and of course where and how many points you locate on the curve greatly affect the drawn result. I've only just started experimenting with TBC control codes, but only to have lines drawn and stopped on my TA map in the field. I've found Bentley cad software to handle/draw curves the best.
Hard to tell from your screen capture, but it looks like your curve is rather small? Hard to read your scale. In general for small curves for use in autodesk or bentley cad base mapping, I collect at least 2 points "on" the curve - excluding the PC/PT. Those 2 points being on the 1/3 and 2/3 point of the curve to try to give the best info to have the curve drawn. Poor looking curves in cad software is either a result of feature in the field not being a simple curve, collecting not enough/poor locations on the curve points in the field, bad observations (rod not being "ready"). You should expect to have to switch control codes for some curves based on the geometry/tangent or non-tangent and how it comes in. I do this at times in both other software I mentioned. Use what works.
Today for the first time I used non-tan PC/PT control codes where is looks like I should have tried smooth curve instead. Looks like non-tangent control codes are for "sharp" obviously non-tangent curves. Smooth curve might be the one to use when things seem tangent in the field and/or when you have a complex large curve with reversing directions.