What thickness of the lines can you advice?
You will have to experiment because it depends on the overall size of your image. Think of it like this: When you scale down the planicon you added to the 2d view then everything in the image shrinks. The same occurs when zooming. That will cause thin lines to "disappear" because they get too thin to display. Use an invisible box of 163.4x419.1 for your 1634 x 4191px image for that 2D symbol: same aspect ratio. In most cases a much lower resolution will work perfectly fine and will better show what happens with thin lines.Check the pixel size of each image and resize the invisible box to the same aspect ratio for the 2D symbol. Obviously too many details will get lost when you shrink the object in your 2D pane so leave them out if possible. That is most likely what happens with the thin lines. If your intention is to print the result then keep in mind that most printers have a relatively low 300 PPI resolution. For that it's useless to create planicons with a much higher resolution. The same goes for on-screen display. If you create them using a 4000K monitor the same images will show less detail on a lower resolution monitor. Thin lines you see on a 4000K monitor might get lost for someone else.
Here i am more thinking about what size should the images be for the Icon and PlanIcon. how many dpi should i use. What are the best lines to use, think of style, thickness and maybe even color to get a better view. For the moment i keep the PlanIcons in "black/white". but some dark green or dark blue can give an better result on screen/print, that why i ask.
Are there some common traps? like putting to many details in the PlanIcon, at print time it is unclear what is is.
I think the most important thing is to create all images in the same style and with the same amount of detail. They should all look like they belong to the same set: consistency. All color, or all B&W. You can make a difference between signs and machines. Are there some common traps? like putting to many details in the PlanIcon, at print time it is unclear what is is.
The same for size. Use the same ratio image<>box for every 2D symbol. You mentioned a machine of 172x443cm. Create an image of 172x443px on a box of 17.2x44.3cm (1:10). Or simply use 1:1 if your 2D plan allows it (box also 172x443cm). Use the same ratio for other machines and objects.
Notice I wrote "172x443px", not "1720x4430px". Such high resolutions are usually wasted on a 2D plan but you can always try and see if it looks different. 172x443px might be a little too low but you get the idea
And maybe the most important one: It's a 2D floorplan, not a high quality photo rendering of an interior. The idea of a floorplan is to show placing of elements, distances between objects, and overall area spaces, etc. That doesn't require highly detailed planicons.
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