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Rendering issues - brightness & lighting

Anonymous

Rendering issues - brightness & lighting

Anonymous
No aplicable

I've recently downloaded the full AutoCAD trial to enable our company to see exploded products in full 3D as opposed to having taken ages drawing them in isometric view and being quite limited in how we can manipulate them.

 

I've got the final product ready to render, however whenever I attempt a render, the output seems to have a few lighting issues. As can be seen in the close up image I've attached, the screws as well as the metal on the socket appear much darker than I'd like - with the screws especially dull considering they're meant to be a stainless steel material. This is after I've already turned exposure down in model space just so that the view didn't appear dark. You can also see in the main exploded render that the valve toward the bottom of the water layout is a darker grey than expected when the material is set as stainless steel. Further to this, as a result of lowering the exposure to brighten the darker areas, the lens has got very bright highlights in the main render, which doesn't look great.

 

I've also noticed that the front plastic of the sockets (and the cut outs on the panel behind) are showing with pointed edges and not smoothly rounded - is this something I have to tweak in settings somewhere to have render correctly?

 

Thirdly, in order to improve the slight blur that appears on the main render, especially if zooming in slightly, would I just need to increase the 'render by level' feature of the render settings?

 

I'm not new to AutoCAD having used LT for many years, however it's been a trial and error approach to 3D and very much a self-taught approach, having taken long enough to even just get some kind of sky/lighting so that the image wasn't total darkness in the first place. So now, after having played around with settings to improve some very dark results I was getting initially, I'm now wondering whether I need to adjust the sunlight settings or whether I'm better off adding lights etc. The result I have is good enough to use, but because I know it could look sleeker I'm not happy with where it's at currently.

 

I've attached the file itself too, so if anyone was to have a look they can look at what settings I have in place.

 

Any help would be greatly appreciated.

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natasha.l
Alumni
Alumni

Hello @Anonymous, 

 

You may need to access your Advanced Rendering settings if the basic settings are not sufficient for your rendering needs. Try reviewing this Lynda video. 

Please "Accept Solution" if a reply or replies have helped resolve the issue or answered your question, to help others in the community.

Alfred.NESWADBA
Consultant
Consultant
Solución aceptada

Hi,

 

>> the output seems to have a few lighting issues

Yep, there is no light in your scene.

 

AutoCAD tries to create a realistic result, in case you have a room without light (and window) you also have a lightning issue. AutoCAD can avoid the situation that there is no light as it sends some default lightning, but that (in most cases I know) don't really help with the scene.

 

Dimensions ... Is that correct, that your screws are 10 Inch long, that your current switch device is 35 Inch wide? If not then you should take care about the dimensions and the light fitting to these dimensions. E.g. the blue block is 1000 Inch high (3.93m), a small lightbulb on top of that block will not make the bottom of that block really bright.

Either your units are wrong or you need lights that are more headlights than just the default light or lightbulbs.

 

>> to improve the slight blur that appears on the main render

Can you please describe what you see as "blur" in the main image (when you look to it at 100% zoom level).

I can't identify anything as blur (just the shadow, but that should be ok as it's just an unspecific default lightning).

 

>> the sockets (and the cut outs on the panel behind) are showing

>> with pointed edges and not smoothly rounded

Not sure where you see pointed edges or none smoothly rendered ...

That's what I get from your drawing (without changing anything, just zoomed in):

 

20190807_234901_0001.png

 

>> I'm now wondering whether I need to adjust the sunlight

>> settings or whether I'm better off adding lights

If you want to have an outdoor scene, you'll need the sun.

If you want to have an indoor scene, you need lights ... and don't forget, you also need the walls around your scene, otherwise your light rays are sent to the infinity instead (as in the reality of an indoor scene) reflected from the environment like wall, window, floor, ceiling, ...

 

HTH, - alfred -

------------------------------------------------------------------------------------
Alfred NESWADBA
ISH-Solutions GmbH / Ingenieur Studio HOLLAUS
www.ish-solutions.at ... blog.ish-solutions.at ... LinkedIn ... CDay 2025
------------------------------------------------------------------------------------

(not an Autodesk consultant)

Alfred.NESWADBA
Consultant
Consultant

Hi,

 

played a bit ... not to have it exactly like you want to (I don't need your expectation), but to show what lights and correct units can do.

 

20190808_001905_0001.png

 

- alfred -

------------------------------------------------------------------------------------
Alfred NESWADBA
ISH-Solutions GmbH / Ingenieur Studio HOLLAUS
www.ish-solutions.at ... blog.ish-solutions.at ... LinkedIn ... CDay 2025
------------------------------------------------------------------------------------

(not an Autodesk consultant)

Anonymous
No aplicable

Brilliant. This goes a long way to helping me achieve what I need. I hadn't realised the units were default as I thought the settings had carried over from LT, so with those changed from inches to mm hopefully that will allow me to put the exposure and light settings on a more normal level.

 

With regards to what I said about pointed edges, I realised it was an issue with the default settings again, just needed to increase the arc and circle smoothness.

 

With my scene it's a little tricky, as its going to go on a document and requires transparent background - so would need there to not be ground shadows or a wall/floor. Ideally I just need fairly even light, so perhaps a couple of lights from the front and side angles will suffice. I'll look into what each type of light brings to a scene and from there play around with them to see which gets the best results.

 

Great help though, thanks!

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