Topics

1

[Max] Bug Reporting / refractive+round edges+curtter = huge slowdown

« on: 2024-11-09, 22:45:57 »

Hi,
setup - "glass" object (green on screenshot), "liquid" object intersecting "glass" with round edge map in bump slot (blue) to add capillarity effect, copy of "glass" with push modifier with a small negative value and a cutter material applied to match glass walls, included "liquid" only (red).


Render time to 1% noise
1. glass+liquid - 21s
2. glass+liquid+round - 36s, 1.7 times slower
3. glass+liquid+cutter - 49s, 2,33 times slower. This is a question by itself - using cutter material gives a significant slowdown.
4. glass+liquid+round+cutter - 249s, 11,8 times slower???

3 - is it expected behavior with cutter and such slowdown? I encountered a noticeable slowdown many times in absolutely different scenes + a bug when a cut object was visible through all scene geometry despite obstacles between it and the camera (but that's another story and I'll report it next time when/if I catch it).

4 looks like a bug. 

2

[Max] Bug Reporting / Hidden tyFlow object perfrom simulation on render stop with Corona only

« on: 2024-10-29, 22:06:20 »

Hi,
problem - clean scene, simple tyFlow object is hidden (as simple as birth operator only, so it won't render anyway), changing frame to let's say 50 doesn't perform simulation, starting render (interactive or production) as well doesn't perform simulation, but when I stop or cancel render, tyFlow start simulation up to current frame (50).

Tyson said

tyFlow objects simulate their result when Max queries their base object for a result

...

hiding a tyFlow object does not guarantee Max will never query it.

I tried Arnold and Scanline - no sim on render end, so probably some problem with Corona?

3

[Max] Bug Reporting / refractive/non-refractive intersection (contact line) bug

« on: 2024-08-28, 11:44:37 »

It's an old problem, I reported it years ago, but it is still not fixed - black contact line between "water" and "ground"

render and scene attached

4

[Max] Bug Reporting / Corona 13 Color management problem

« on: 2024-08-23, 11:09:07 »

Hi, the image saved from a VFB looks different when color management is set to OCIO.

Display/View-Transform is enabled (obviously without it images are dark).

So, if max saves images or from native max VFB - all ok, but if I save it from VFB 2.0 or 1.0 - looks wrong. It seems like a few months ago all worked fine - I worked on a project in March and everything was fine (or I didn't notice the difference that time...)
The next one is probably max problem, but just to ask. Same settings:
2024 renderoutput - save png and exr exactly as in VFB.
2025 renderoutput - save png but not exr, exr is dark, it seems like it skips conversion.
Is it max problem or can be something you can fix?

Latest Corona daily.

5

[Max] Bug Reporting / single object multi/sub-obect absorpiton (refraction) problem

« on: 2024-02-19, 14:23:13 »

Hi,
looks like it's a very old problem but I thought it was fixed?

"liquid" inside "glass" works fine if it's 2 separate objects, but as soon as I attach them into a single - I'm getting result as on the screenshot.

Same materials, left side is separate objects, right side single object.
Top 4 - "liquid" without absorption
Bottom 4 - "glass" without absorption

6

[Max] Bug Reporting / Corona Bitmap Color space/RGB primaries not working properly

« on: 2024-02-12, 13:53:04 »

Or maybe I'm doing something wrong?
Screenshot is attached

Changing RGB primaries in corona bitmap has a subtle, almost unnoticeable effect. 3dsmax bitmap working as expected by selecting color space during load (those settings not affecting corona bitmap).

Latest daily build

7

[Max] Resolved Bugs / CoronaPattern not receiving caustics

« on: 2023-02-06, 13:39:17 »

Nothing to explain - seems like caustics don't see the pattern.

8

[Max] Resolved Bugs / Corona slicer not working with single-sided geometry

« on: 2022-01-24, 17:33:14 »

Check images, same scene, just different camera rotation. Such behavior was in all previous versions.

9

[Max] I need help! / PhoenixFD Ocean texture + Corona decal

« on: 2021-12-16, 23:28:25 »

The height parameter in ocean texture set to vector mode is ignored if corona decals are added to this object.

10

[Max] Bug Reporting / Aerial perspective produces the wrong result in some situations

« on: 2021-12-14, 19:24:31 »

All simple, check the images.

Top view, corona camera, not orthographic. Render with default corona material as override and volume effect 10 - increased to see result better.
The second image with greatly increased contrast in PS to see where that volume effect produces the strongest result.

Additionally - not sure but seems like in some situations it produces the wrong color, like in a clean scene with sun and default corona material as override - adding volume effect gives some red/purple tint to the scene.

The above is true for at least a few latest DB.

And few questions:
1. aerial perspective still not working with volumetrics, will that be fixed in some nearby future?
2. is it possible to make it true volumetric (checkbox to switch between shader and volumetric)? Or maybe it'll be even if we can plug some map into volumetric material scattering/absorption.

11

[Max] Resolved Bugs / black edge + opacity bug in refractive material

« on: 2021-07-22, 21:08:38 »

1. Black edge where object with refractive material contacts other geometry - image attached.
2. Setting opacity to 0 makes fog like material.
On the second image water material have opacity 0, but underneath surface have blue color.
The third image is a preview but the sphere is still barely visible.

Both problems appear on physical and legacy materials.

Corona V7.

12

[Max] Resolved Bugs / Huge slowdown when using corona distance

« on: 2021-02-09, 13:26:31 »

I have few materials. When applied to object separately speed ranging 7-14M. When mixed in multilayer material with corona distance - speed is 700k +/-

Same problem with opacity. I have a landscape model + a lot of buildings with pools. Bottom of pools below ground level - instead of cutting geometry I used corona distance to cut it during render - speed dropped twice.

Maybe that's correct behavior with opacity, but 10 times slowdown with mixing materials looks strange.

13

[Max] Resolved Bugs / Moving VDB volume in interactive very slow + bounding box visible

« on: 2021-02-09, 13:16:36 »

Nothing to explain here - moving vdb or changing settings very slow, looks like reload each time

And the problem with the visible bounding box still here - with global volume or inside/intersecting with another object with volume mtl.

14

[Max] Resolved Bugs / Weird pattern with 2,5D displacement and procedurals

« on: 2021-02-09, 13:05:38 »

example of PhoenixFD ocean

This could be solved by switching to 3D displacement previously but not anymore

Same weird result I had with prosimplex.

15

[Max] Resolved Bugs / Max freeze for a long time after stopping IR and sometimes regular render

« on: 2021-02-07, 19:48:28 »

The problem looks similar to already posted here by mahjoub but I created a new topic because of:

1. It happens for a couple of years already and I'm using the latest daily builds, so the problem here for a long time.
2. Happens in completely (almost) different scenes.
3. Not looks like it bound to resolution.

Almost different is because those scenes have something similar - a lot of objects and a lot of materials (and big scale, but I don't think that's the problem). It never happened with productviz scenes and some small archviz like couple of buildings or some interiors.

So the problem: if I run IR and moving or creating objects, moving camera - all fine most of the time, let's say 95% it works fine - I can stop IR and all good. BUT, if I do changes to some materials - it works fine until I stop IR, then max becomes locked for a long time (5-40 min). And again that not 100% cases but it almost for sure, that after doing changes it'll lock max.

Sometimes that happened if I even didn't make any changes, so just run IR and stop it after some time lock max as well, same for regular render - but that happens rarely.

The problem occurs even with isolated objects, so hiding everything except one certain object will behave same way, so I have to move that object to another scene to work with it and then back.

Another interesting thing - sometimes I still can work for a couple of seconds after closing IR and then max became locked.
 
At some point in those scenes I stopped using IR and did regular test renders instead with cancel at the end, not stopping. Can't say for sure, but seems like cancel work better - I can't remember freeze after cancel, but can't guarantee that.

And one more thing I tried - selected all objects in scene (seems like there were around 12k of them) and applied one material to all. IR seems to be running ok after that. I did 3-4 runs, applied some materials to few objects during IR and seems like all fine. Again - can't say for sure if the problem eliminated, as it does not occur in 100% of cases.

Summary of the bug: scenes with high object and materials count, freeze occurs mostly after doing changes to materials during IR, but sometimes it happens without any changes and with regular render. PROBABLY reason is a lot of materials.

P.S. I'll create few more topics with bugs that annoy me for a long time and with newcomers found recently. That about 2,5D displace quality, openvdb and corona distance.