topic Re: segment resolution at 1:1 in Modeling

segment resolution at 1:1

Aussie John — Mon, 30 Dec 2024 15:12:02 GMT

Have I run into a limitation of archicad at 1:1 scale where curves have poor segmentation in 3D. The 'column" in the screenshot is 14mm diameter. Or can I adjust the segmentation somewhere? Thanks John

Re: segment resolution at 1:1

Erwin Edel — Wed, 01 Aug 2018 06:38:38 GMT

Only by converting it to a morph and then increasing segmentation, assuming after converting to morph it is still trying to be a cylinder and not some 8-10 sided shape.

Re: segment resolution at 1:1

Barry Kelly — Wed, 01 Aug 2018 07:07:43 GMT

It has nothing to do with the scale.
Although you can set the scale in 3D, it will make no difference.
It is a limitation in Archicad that when a column gets a smaller diameter, the segmentation reduces.

If you draw a circle the same diameter and magic wand a slab to it, you will find that the segmentation is fine.

Barry.

Re: segment resolution at 1:1

Daniel Kovacs — Tue, 28 Aug 2018 13:08:51 GMT

Hi John,

Unfortunately you cannot control the segmentation, it is hardwired into ARCHICAD. The rule it uses is that the distance between the true arc and the chords cannot be bigger than 1 mm, and the number of segments has to be at least 8 (so if the arc was so tiny that based on the 1 mm rule it would have eg. 5 sides, then it generates the arc with 8 segments instead).

Converting the column to morph and increasing the number of curve segments can be a workaround if 1mm accuracy is not enough, but more detailed segmentation can significantly increase the polygon count of the model (and it would also not behave as a column anymore).

Regards,

Re: segment resolution at 1:1

Aussie John — Wed, 12 Sep 2018 06:46:19 GMT

for info I changed the working units to metres instead of mm. Ill try to reduce the scale in the stl export.