topic Re: Incorrect shadows in ArchiCAD 19 openGL engine in Modeling

Incorrect shadows in ArchiCAD 19 openGL engine

levonarsh — Wed, 24 May 2023 17:26:23 GMT

There is a scene with gdl objects imported from Sketchup. When rendering 3d with openGL,getting incorrect shadows. While in internal engine everything is correct. In ArchiCAD -18 openGL the shadows are OK too.. When converting gdl to morph I realise that they are non solid. After union the morphs become solid and the shadows are correct. How to solve this? Attaching the images and the file.

Re: Incorrect shadows in ArchiCAD 19 openGL engine

Laszlo Nagy — Mon, 26 Oct 2015 15:40:53 GMT

You can select the Morph and use the File\Libraries and Objects\Save Selection As\Object to re-save it as Object. Then you will again have the correct solid geometry in a GDL Object form.

Re: Incorrect shadows in ArchiCAD 19 openGL engine

levonarsh — Mon, 26 Oct 2015 16:25:40 GMT

laszlonagy wrote:
You can select the Morph and use the File\Libraries and Objects\Save Selection As\Object to re-save it as Object. Then you will again have the correct solid geometry in a GDL Object form.

I am importing 200 furniture details. It is impossible to convert them all separately to morph,and then again to GDL. In ArchiCAD 18 the same file is rendered correctly. Maybe in future updates this will be corrected?

Re: Incorrect shadows in ArchiCAD 19 openGL engine

Laszlo Nagy — Mon, 26 Oct 2015 16:40:29 GMT

I see.
Could you ZIP and post 1or 2 of these objects as attachments? Hope they are not very large object so the forum will allow them to be uploaded.
If this is an OpenGL error then the developers might be interested in knowing about it. OpenGL has been rewritten for ARCHICAD 19, so this may be an issue arising from that.

Re: Incorrect shadows in ArchiCAD 19 openGL engine

levonarsh — Mon, 26 Oct 2015 21:07:47 GMT

laszlonagy wrote:
I see.
Could you ZIP and post 1or 2 of these objects as attachments? Hope they are not very large object so the forum will allow them to be uploaded.
If this is an OpenGL error then the developers might be interested in knowing about it. OpenGL has been rewritten for ARCHICAD 19, so this may be an issue arising from that.

Yes,shure. I,ll post the scene.

Re: Incorrect shadows in ArchiCAD 19 openGL engine

Laszlo Nagy — Mon, 26 Oct 2015 22:48:56 GMT

I have checked the file.

Firstly, I can see now that SketchUp files are always imported as faces and not as solid bodies. This is probably so that any type of geometry can be imported.

Secondly, as I see the Shadow problem is caused by faces with no thickness. These converted GDL objects now consist of faces, as you noted, not a solid body.
The faces with no thickness cast incorrect shadows.
I tried to place a horizontal Morph face instead of the horizontal element and it also cast incorrect shadow.
Then, when I extruded the Morph downward a bit to give it some thickness, the shadows were immediately correct.
So I think this happens because those faces have no thickness.

I will report this to Graphisoft.

Re: Incorrect shadows in ArchiCAD 19 openGL engine

Stress Co_ — Tue, 27 Oct 2015 05:29:04 GMT

I've not used it, but maybe MODELPORT would work to convert your Sketchup objects.
I recently watched a compelling webinar on the subject.
The converted object will be better quality and smaller file size.
Test the demo.

Re: Incorrect shadows in ArchiCAD 19 openGL engine

Katalin Borszeki — Mon, 23 Nov 2015 13:57:39 GMT

Hi all,
Thanks for drawing our attention to this bug. We plan to fix the shadows of sketchup imported objects in a future AC19 Update.
Until then the workaround for creating correct shadows is to convert the objects to morphs and give thickness to the Sketchup created surfaces. Tx, k

Re: Incorrect shadows in ArchiCAD 19 openGL engine

rozky — Thu, 17 Dec 2015 07:17:20 GMT

all planar object (gutter, hyperboloid etc )from AC library has same issue.
hope that fix will be released soon

Re: Incorrect shadows in ArchiCAD 19 openGL engine

jkershaw — Mon, 03 Oct 2016 17:44:24 GMT

Did this ever get fixed? I'm having the same issue with a Sketchup model. Using latest build (7006).