x

Search in
Sort by:

Question Status:

Search help

  • Simple searches use one or more words. Separate the words with spaces (cat dog) to search cat,dog or both. Separate the words with plus signs (cat +dog) to search for items that may contain cat but must contain dog.
  • You can further refine your search on the search results page, where you can search by keywords, author, topic. These can be combined with each other. Examples
    • cat dog --matches anything with cat,dog or both
    • cat +dog --searches for cat +dog where dog is a mandatory term
    • cat -dog -- searches for cat excluding any result containing dog
    • [cats] —will restrict your search to results with topic named "cats"
    • [cats] [dogs] —will restrict your search to results with both topics, "cats", and "dogs"

4.8.0 Preview 2 Physics more explodey?

Anyone else noticing more random reactions to contact in 4.8.0?

I have some gameplay based on stacking objects. There are rectangular objects with a variety of dimensions with an axis lock to have them stuck on the Y axis but free to move and rotate otherwise.

Gameplay consists of dropping blocks onto the existing stacks. Falling blocks have some impulses applied to influence fall speed and horizontal placement.

Moving to 4.8.0 I'm noticing that the stacks of objects that from have a tendency to explode when new objects land on them.

-Tom

Product Version: UE 4.8 Preview
Tags:
more ▼

asked May 18 '15 at 07:26 PM in Using UE4

avatar image

theonecalledtom
1.3k 61 68 271

avatar image theonecalledtom May 18 '15 at 07:51 PM

Starting to narrow down when it happens. Seems more likely when I have my friction levels high. A dropping block comes down on one side of a bunch of touching blocks and the whole bunch goes kabamn and rotates up around the block that just hit them (kinda like a see saw). With lower friction levels I'm still seeing it but significantly reduced.

It seems to happen without control impulses applied.

Difficult to describe and my simple stacking brick test level doesn't exhibit the same problem.

avatar image theonecalledtom May 23 '15 at 09:14 PM

This continues to be true in preview 3. Mostly solid but occasionally landing a brick on the edge of a pile of bricks (anywhere between 3 and 30) causes the whole pile to blast off. Energy Conservation 0, cool piles of bricks exploding 1.

avatar image theonecalledtom Jun 24 '15 at 03:56 PM

I was able to reduce the explosion issues, though they still exist, by clamping angular velocity and adding more damping. This leaves the physics more dead, but my gameplay viable.

In my case if this is still a problem when I get to ship I can further reduce the bad effects with more hacks, however the physical effect will be much reduced and just not as cool (tm) as it was back in the good old days of 4.7 :)

(comments are locked)
10|2000 characters needed characters left
Viewable by all users

2 answers: sort voted first

Things seemed much better in 4.8.4 but I never closed this issue.

Closed!

more ▼

answered Jul 30 '15 at 10:27 PM

avatar image

theonecalledtom
1.3k 61 68 271

(comments are locked)
10|2000 characters needed characters left
Viewable by all users

I also have severe problems with projects that have physics in them and can confirm problems here.

https://answers.unrealengine.com/questions/242857/physx-constraints-disintegrate-in-ue48-was-ok-in-4.html

Could Epic please look into physics of UE4.8 as this renders many projects that were worked on since 4.6 unplayable.

more ▼

answered Jun 15 '15 at 06:52 PM

avatar image

MaZi1
26 1 3 5

(comments are locked)
10|2000 characters needed characters left
Viewable by all users
Your answer
toggle preview:

Up to 5 attachments (including images) can be used with a maximum of 5.2 MB each and 5.2 MB total.

Follow this question

Once you sign in you will be able to subscribe for any updates here

Answers to this question