topic Re: Rendered model not matching Viewport model in 3ds Max Forum

Rendered model not matching Viewport model

HARRY.WALSH — Thu, 11 May 2023 11:42:00 GMT

Hi, I've had an issue recently on my new laptop which I didn't have an issue on my Desktop.

When I've rendered an image of my viewport (with 'Camera001'), the model is completely out of perspective/position. Even though i have aligned it all how I need it with perspective match accurately, when the image is rendered its completely wrong, as you can see it is dramatically higher/out of position.

You might think moving the model lower would get it aligned, you are wrong. its like there is an scaling issue.

I've checked if the safe frames, render settings, viewport settings correctly which are all the same settings i used on my desktop.

I've never had this issue before and cant see any other forums having the same issue...I don't know what else to do.

Any help would be much appreciated.

Re: Rendered model not matching Viewport model

Byteman — Thu, 11 May 2023 17:40:02 GMT

This probably has something to do with the rendering resolution and the non-rendered area being displayed in the viewports.
Press Shift+F to display the Safe Frame area, the shortcut of which can be found in the menu under the Viewport name. (eg: Camera001 in your case)

Edit: Sorry to have typed without looking at the image, I guess it is already enabled.

Then it is possible that some aspect ratio values are causing the problem. Have you checked these?

Re: Rendered model not matching Viewport model

HARRY.WALSH — Fri, 12 May 2023 11:16:20 GMT

Hi, yes ive already done the safe frames. ive also tried the aspect ratios youve mentioned (all 3 of them) and still no luck...

Re: Rendered model not matching Viewport model

Byteman — Sat, 13 May 2023 15:00:14 GMT

I'd like to see a copy of the file if you don't mind. Some obvious problems come to the mind only when you see it.

my e mail: nezihk@hotmail.com

Re: Rendered model not matching Viewport model

HARRY.WALSH — Mon, 15 May 2023 08:33:46 GMT

Im unable to send it over email (file too large). below is a dropbox link you can download...

https://www.dropbox.com/s/g2a4386q55d0ubo/Leigh%20Acady.max?dl=0

cheers

Re: Rendered model not matching Viewport model

Byteman — Mon, 15 May 2023 15:43:57 GMT

You may consider sending Max files as compressed, and use the File/Archive... command if possible. This way the maps will be included in the zip file.

Re: Rendered model not matching Viewport model

HARRY.WALSH — Tue, 16 May 2023 13:49:08 GMT

Hi, the file is still too large even compressed...

i have attached the maps below, HDRI & background image...

Re: Rendered model not matching Viewport model

Byteman — Tue, 16 May 2023 20:56:54 GMT

HiHarry,

I've written a long post before logging in and lost all the information - I'll try to summarize:

I believe your scene size is large. Your System Unit is inches and Display Units is Generic which -to my experience- means your units are in Inches. The tubes are about 6600 inches. Almost at a height of a skyscraper.

Max -just like the programs of its category- has a limitation of precision. Large scales may cause problems in many areas.

I've switched to Corona Renderer at first. Your Camera renders fine in Corona Renderer. Switching back to Arnold, your camera was again rendering the tip of the tubes out of the view. At first I thought it has something to do with Arnold. (May be a post effect) but I've placed a new camera just over your camera and saw that the new camera renders fine, only needs perspective adjustments.

That is when I noticed that your camera shape is distorted. I believe you've added some sort of perspective correction.

To see the distortion in detail, I zoomed in the camera in the Front Viewport and to my surprise, your objects get distorted in the viewports as I get close to them. Look at the below Front Viewport.

What you see in the image is your Camera zoomed in. Upon zooming in more, it eventually disappears after a few more garbled versions.

Max has a limited Decimal Places of Accuracy. You need to keep your scenes in the intermediate scale to have enough space for Precision. In a scene with extents of around 16.777.216 inches, the smallest distance you can move is 1 inch. This is a shortcoming of all Single Precision software. This extent concept is the distance of objects from the origin. Even if you have your objects around the origin, at an acceptable size, when you have a single object placed at such a distance from the origin, you'll have precision issues. These range from jagged motion of objects to black stripes with jagged edges over entire objects. (Clipping issues) Clipping also shows in the form of disappearing objects when getting close to or farther away from the objects.

This precision will even manifest itself as severely as corrupting your objects, when you change your System Unit Scale so that the precision required to display the details of your object is way smaller than your newly set System Scale and the object's distance is far from the origin.

Consider adjusting the scale of your scene and re-create a new camera for that scene.

Hope this helps.

Re: Rendered model not matching Viewport model

HARRY.WALSH — Fri, 19 May 2023 08:22:53 GMT

Hi thanks for the reply.

I opened a new max file started scratch again, new camera, imported .dwg model in millimeters which is what it should've been (so thank you for that) and I thought that could've been the issue but it appears not. The rendered model is still distorted/out of position, if anything worse than before... this confuses me more. See below image...

I've gone back to my old desktop and the procedure I do is the exact same as I've done it on the laptop and there has been no issues. To me I think its programming issue with Autodesk rather than a scene/setup issue.

I'm not sure if you can help with this... any pointers would be much appreciated.

Cheers

Harry

Re: Rendered model not matching Viewport model

Diffus3d — Wed, 24 May 2023 07:31:36 GMT

@Byteman ,

That was an incredible post. /salute.

Best Regards