[Interest] Qt3D

Igor Mironchik igor.mironchik at gmail.com
Sat Apr 8 22:14:34 CEST 2017


I killed whole day today to understand one simple thing - parent 
transformation applies on children too in Qt3D.

Parent is not simple owner of the object it applies its transformation 
to the children...

OMG, so much time and nerves... :)

08.04.2017 17:03, Igor Mironchik пишет:
> Hi,
> Sorry guys. It seems that it my fault...
> 08.04.2017 15:18, Igor Mironchik пишет:
>> Hello guys,
>> Did anybody do any 3D project with new Qt3D? Did you do the scene 
>> dynamically? I.e. did you allocate new and new QEntity with parent? 
>> Do you see every QEntity? Does Qt3D stable?
>> A lot of questions.
>> I've played a little with Qt3D, I'm trying to implement 3D tree which 
>> starts with one vertical branch and 2 leafs. First leaf I see, the 
>> second - doesn't. It created but doesn't seen.
>> When I deleted leafs, i.e. winter came, they dissapear, it's ok. but 
>> in spring I create new branches and leafs. They creates, but doesn't 
>> seen on the scene.
>> In autumn I change colors of QPhongMaterial and my leaf becomes 
>> black... Is it a bug? Or I miss something.
>> Why does the scene with ~20 QEntity eats so much CPU? 3 entities 
>> ~17%, 13 - ~ 40%, > 20 - ~75%, etc...
>> I'm new at Qt3D, so maybe it's my bugs, missunderstanding of 
>> something, that is why I'm asking.
>> The first approximation is located here: 
>> https://github.com/igormironchik/3Dtree
>> If you wnat you can look at it. I know that I have bug with placing a 
>> leaf (and probably child branches)...

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