topic Re: Texture changing tone in empty doorway in Modeling

Texture changing tone in empty doorway

Anonymous — Wed, 24 May 2023 06:14:11 GMT

There's a weird change of tone happening when I put an empty opening (arch) through this wall
Shadows are definitely off, no idea what's happening
Any thoughts?

Re: Texture changing tone in empty doorway

Barry Kelly — Wed, 27 Feb 2019 01:14:38 GMT

An adjoining wall (or other element) perhaps?

What happens if you make the opening a little narrower or move it away from the side wall?

Barry.

Re: Texture changing tone in empty doorway

Anonymous — Wed, 27 Feb 2019 01:17:26 GMT

Nope. I've moved the entire wall including the empty arch to another location - that weird line still appears

Re: Texture changing tone in empty doorway

Anonymous — Wed, 27 Feb 2019 01:22:34 GMT

I've isloated the wall & empty opening in question into a blank file - it still occurs
You can download the file https://www.dropbox.com/s/l8suke8g0eglu7z/Wall.pln?dl=0

Re: Texture changing tone in empty doorway

Barry Kelly — Wed, 27 Feb 2019 01:26:48 GMT

It could be the way the WALLHOLE or WALNICHE has been scripted.
There may be more than one and they may have different materials used in them?

If you change the wall edge to a different material, dos the opening change?
It may depend on how the opening id scripted.
Or can you control the edge material in the object?

Is it a standard opening object or one you have made?

Barry.

Re: Texture changing tone in empty doorway

Anonymous — Wed, 27 Feb 2019 01:29:25 GMT

Just the standard Arch Top Door Opening that I've used

There's no control of edge material, either "Same as Wall Edge" or "Same as Wall Side". Neither makes a difference

Re: Texture changing tone in empty doorway

Anonymous — Wed, 27 Feb 2019 01:32:58 GMT

Interestingly if the width of the empty opening changes, that weird horizontal line changes as well

I am thinking it might be a bug to do with the OpenGL or curve resolution

Re: Texture changing tone in empty doorway

Barry Kelly — Wed, 27 Feb 2019 01:34:43 GMT

No it is just the angle of your sun.
I have switched to Axonometric but it is a similar setting in perspective.

Barry.

Re: Texture changing tone in empty doorway

Anonymous — Wed, 27 Feb 2019 01:38:25 GMT

Ah interesting

Do you think that is a bug though? I wouldn't expect there to be such a sharp change / division in surface tone when shadows are turned off

Re: Texture changing tone in empty doorway

Barry Kelly — Wed, 27 Feb 2019 01:58:37 GMT

benjamin_chan wrote:
Do you think that is a bug though? I wouldn't expect there to be such a sharp change / division in surface tone when shadows are turned off

Definitely something strange going on.
When I opened your file the shadows were on, but when I turned them off the shadow was still there.

In vectorial engine the shadows on the inside of the opening are different to those in OpenGL.
I would say there is something wrong with the OpenGL textures.
Just what I wouldn't know though.

Even changing the opening shape to different objects changes the side shadow.

Barry.

Re: Texture changing tone in empty doorway

Barry Kelly — Wed, 27 Feb 2019 02:06:08 GMT

Just thought I would try my opening object.
Perfect.

So there is something in the scripting of the GS openings that is causing the problem - but only in OpenGL.
I wouldn't have a clue where to start in their scripts.

Barry.

Re: Texture changing tone in empty doorway

Anonymous — Wed, 27 Feb 2019 02:09:32 GMT

Good to know, thanks Barry for looking into it

Re: Texture changing tone in empty doorway

Daniel Kovacs — Mon, 25 Mar 2019 11:42:08 GMT

Hi,

Has this been resolved? I just placed a new empty door opening in a new file, and it works just fine, so there must be something specifically about your file. If you still have this problem, could you upload your test file again, so that I can take a look and see if it is an error, or a wrong setting?

Thanks,

Re: Texture changing tone in empty doorway

Anonymous — Mon, 25 Mar 2019 11:57:03 GMT

Thanks for looking into it

Here's the file
https://www.dropbox.com/s/l8suke8g0eglu7z/Wall.pln?dl=0

Re: Texture changing tone in empty doorway

Daniel Kovacs — Thu, 02 May 2019 12:07:08 GMT

Hello,

Sorry for the late reply. I looked into it, and it is caused by a very specific combination of things in how the shading ("self-shadow") of the opening is calculated.

The shading method this object uses tries to make a transition between the shading of the curved surface and the shading of the vertical part. When calculating this transition, it takes the direction of the sun into consideration, and also the surface settings. The setting combination that causes this is the following:

the direction of the sun (Azimuth) is 178º
the Shininess of the surface is weak (should be around 40)
the Specular of the surface is too strong (should be around 25)

If you just change the sun direction, it should work fine, but then if you set it to a problematic angle again, this might happen again. If you change the OpenGL surface settings, then it should be fine from now on. This only affects the OpenGL engine, so these setting changes should not affect rendered images.

I hope these suggestions help, and cleared things up a bit.

Regards,