Empathy List Archives

B

BRietzl

Fri, Sep 27, 2019 8:07 AM

My objects designed with openSCAD use a bunch of colors. My problem is that
they are hardly distinguishable in the shadow zone. Is is possible to adjust
quasi-shadowing somehow? I searched the GUI for a setting and the manual,
but didn't find anything. This would also be a good candidate for another
special variable from 0 (no shadow) to 1 (dark shadow) for a scene.

--
Sent from: http://forum.openscad.org/

My objects designed with openSCAD use a bunch of colors. My problem is that they are hardly distinguishable in the shadow zone. Is is possible to adjust quasi-shadowing somehow? I searched the GUI for a setting and the manual, but didn't find anything. This would also be a good candidate for another special variable from 0 (no shadow) to 1 (dark shadow) for a scene. -- Sent from: http://forum.openscad.org/

NH

nop head

Fri, Sep 27, 2019 8:14 AM

I don't see any shadows in OpenSCAD. It doesn't do ray tracing, just a
crude flat shading model with diffuse lighting.

On Fri, 27 Sep 2019 at 09:01, BRietzl bernhard@rietzl.de wrote:

My objects designed with openSCAD use a bunch of colors. My problem is that
they are hardly distinguishable in the shadow zone. Is is possible to
adjust
quasi-shadowing somehow? I searched the GUI for a setting and the manual,
but didn't find anything. This would also be a good candidate for another
special variable from 0 (no shadow) to 1 (dark shadow) for a scene.

--
Sent from: http://forum.openscad.org/

OpenSCAD mailing list
Discuss@lists.openscad.org
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

I don't see any shadows in OpenSCAD. It doesn't do ray tracing, just a crude flat shading model with diffuse lighting. On Fri, 27 Sep 2019 at 09:01, BRietzl <bernhard@rietzl.de> wrote: > My objects designed with openSCAD use a bunch of colors. My problem is that > they are hardly distinguishable in the shadow zone. Is is possible to > adjust > quasi-shadowing somehow? I searched the GUI for a setting and the manual, > but didn't find anything. This would also be a good candidate for another > special variable from 0 (no shadow) to 1 (dark shadow) for a scene. > > > > -- > Sent from: http://forum.openscad.org/ > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

M

MichaelAtOz

Fri, Sep 27, 2019 8:38 AM

I presume it is there areas

http://forum.openscad.org/file/t359/Capture_shading.jpg

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Sent from: http://forum.openscad.org/

I presume it is there areas <http://forum.openscad.org/file/t359/Capture_shading.jpg> ----- Admin - email* me if you need anything, or if I've done something stupid... * click on my MichaelAtOz label, there is a link to email me. Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above. The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out! -- Sent from: http://forum.openscad.org/

B

BRietzl

Fri, Sep 27, 2019 9:01 AM

nophead wrote

I don't see any shadows in OpenSCAD. It doesn't do ray tracing, just a
crude flat shading model with diffuse lighting.

Therefore I called it "SEMI-Shadowing". Surfaces pointing to the right are
darker (SEMI-shadow zones) than surfaces with the same color pointing to the
left. If you call it "crude flat shading model with diffuse lighting" then
it is ok, but the crucial thing is, that it does NOT seem to be adjustable,
therefore you probably call it "crude".

--
Sent from: http://forum.openscad.org/

nophead wrote > I don't see any shadows in OpenSCAD. It doesn't do ray tracing, just a > crude flat shading model with diffuse lighting. Therefore I called it "SEMI-Shadowing". Surfaces pointing to the right are darker (SEMI-shadow zones) than surfaces with the same color pointing to the left. If you call it "crude flat shading model with diffuse lighting" then it is ok, but the crucial thing is, that it does NOT seem to be adjustable, therefore you probably call it "crude". -- Sent from: http://forum.openscad.org/

B

BRietzl

Fri, Sep 27, 2019 9:17 AM

MichaelAtOz wrote

I presume it is there areas

<http://forum.openscad.org/file/t359/Capture_shading.jpg>

Exactly these areas! I want to have them less dark to better distiguish
between the dark shaded colors. Shading should be softer, at best
adjustable.

--
Sent from: http://forum.openscad.org/

MichaelAtOz wrote > I presume it is there areas > > <http://forum.openscad.org/file/t359/Capture_shading.jpg> Exactly these areas! I want to have them less dark to better distiguish between the dark shaded colors. Shading should be softer, at best adjustable. -- Sent from: http://forum.openscad.org/

NH

nop head

Fri, Sep 27, 2019 9:28 AM

Yes it would be a lot better with specular lighting and non diffuse lights
so that flat faces at the same angle are not all the same colour and curved
surfaces had highlights. I don't know if it is possible with OpenCSG.

There are two lights in the scene and I think they might be placed where
they are to get around negative faces being back to front rather than
giving a nicely lit scene.

On Fri, 27 Sep 2019 at 10:10, BRietzl bernhard@rietzl.de wrote:

MichaelAtOz wrote

I presume it is there areas

<http://forum.openscad.org/file/t359/Capture_shading.jpg>

Exactly these areas! I want to have them less dark to better distiguish
between the dark shaded colors. Shading should be softer, at best
adjustable.

--
Sent from: http://forum.openscad.org/

OpenSCAD mailing list
Discuss@lists.openscad.org
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

Yes it would be a lot better with specular lighting and non diffuse lights so that flat faces at the same angle are not all the same colour and curved surfaces had highlights. I don't know if it is possible with OpenCSG. There are two lights in the scene and I think they might be placed where they are to get around negative faces being back to front rather than giving a nicely lit scene. On Fri, 27 Sep 2019 at 10:10, BRietzl <bernhard@rietzl.de> wrote: > MichaelAtOz wrote > > I presume it is there areas > > > > <http://forum.openscad.org/file/t359/Capture_shading.jpg> > > Exactly these areas! I want to have them less dark to better distiguish > between the dark shaded colors. Shading should be softer, at best > adjustable. > > > > -- > Sent from: http://forum.openscad.org/ > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

AG

Alex Gibson

Fri, Sep 27, 2019 10:06 AM

I would be really interested to learn more about how OpenSCAD lighting rendering works currently.

More complex lighting, or really any level of more advanced scene rendering, feels to me like a whole new area of scope compare to our current expectations, which is just enough to better see the 3D structure. One option might be to export your differently coloured parts as a series of separate models, and import them to another CAD software with more advanced control, such as Blender.

What I think would be nice in OpenSCAD is just to be able to better control what we have – IE could we specify placement of one, two or more lights. This alone could solve the OP’s issue by allowing a light source to be targeted at the area the colours need to be seen better.

Alex Gibson

admg consulting

edumaker limited

· Project management

· Operations & Process improvement

· 3D Printing

From: Discuss [mailto:discuss-bounces@lists.openscad.org] On Behalf Of nop head
Sent: 27 September 2019 10:29
To: OpenSCAD general discussion
Subject: Re: [OpenSCAD] Problem with semi-shadowing

Yes it would be a lot better with specular lighting and non diffuse lights so that flat faces at the same angle are not all the same colour and curved surfaces had highlights. I don't know if it is possible with OpenCSG.

There are two lights in the scene and I think they might be placed where they are to get around negative faces being back to front rather than giving a nicely lit scene.

On Fri, 27 Sep 2019 at 10:10, BRietzl bernhard@rietzl.de wrote:

MichaelAtOz wrote

I presume it is there areas

<http://forum.openscad.org/file/t359/Capture_shading.jpg http://forum.openscad.org/file/t359/Capture_shading.jpg&gt >

Exactly these areas! I want to have them less dark to better distiguish
between the dark shaded colors. Shading should be softer, at best
adjustable.

--
Sent from: http://forum.openscad.org/

OpenSCAD mailing list
Discuss@lists.openscad.org
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

I would be really interested to learn more about how OpenSCAD lighting rendering works currently. More complex lighting, or really any level of more advanced scene rendering, feels to me like a whole new area of scope compare to our current expectations, which is just enough to better see the 3D structure. One option might be to export your differently coloured parts as a series of separate models, and import them to another CAD software with more advanced control, such as Blender. What I think would be nice in OpenSCAD is just to be able to better control what we have – IE could we specify placement of one, two or more lights. This alone could solve the OP’s issue by allowing a light source to be targeted at the area the colours need to be seen better. Alex Gibson admg consulting edumaker limited · Project management · Operations & Process improvement · 3D Printing From: Discuss [mailto:discuss-bounces@lists.openscad.org] On Behalf Of nop head Sent: 27 September 2019 10:29 To: OpenSCAD general discussion Subject: Re: [OpenSCAD] Problem with semi-shadowing Yes it would be a lot better with specular lighting and non diffuse lights so that flat faces at the same angle are not all the same colour and curved surfaces had highlights. I don't know if it is possible with OpenCSG. There are two lights in the scene and I think they might be placed where they are to get around negative faces being back to front rather than giving a nicely lit scene. On Fri, 27 Sep 2019 at 10:10, BRietzl <bernhard@rietzl.de> wrote: MichaelAtOz wrote > I presume it is there areas > > <http://forum.openscad.org/file/t359/Capture_shading.jpg <http://forum.openscad.org/file/t359/Capture_shading.jpg&gt> > Exactly these areas! I want to have them less dark to better distiguish between the dark shaded colors. Shading should be softer, at best adjustable. -- Sent from: http://forum.openscad.org/ _______________________________________________ OpenSCAD mailing list Discuss@lists.openscad.org http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

T

TLC123

Tue, Oct 8, 2019 4:09 PM

visibility sure is important but i don't know if full control of all light
positions give the best for most.
everything is dark until you set up boiler plate light . that another
treshold for beginners.
for a quick increase in shape visibility there a better option some
postprocesing.
If there is trivial access to the depth buffer after openCSG pass a thing
like
Screen space ambient occlusion (SSAO) could enhance shape perception a good
bit with not too much effort.

--
Sent from: http://forum.openscad.org/

visibility sure is important but i don't know if full control of all light positions give the best for most. everything is dark until you set up boiler plate light . that another treshold for beginners. for a quick increase in shape visibility there a better option some postprocesing. If there is trivial access to the depth buffer after openCSG pass a thing like Screen space ambient occlusion (SSAO) could enhance shape perception a good bit with not too much effort. -- Sent from: http://forum.openscad.org/

discuss@lists.openscad.org

Problem with semi-shadowing

The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out!