Collision Oddities On Models

Questions
1

Hey! I’ve been trying to learn a 3d modeling software to use in an upcoming project with Defold. I’m having some difficulties in my test scene. Not sure if I’m doing something wrong or not.

Oddity #1) Collision will turn sideways in editor but be fine in game.

Here is how it should look in game:

normal_collection
normal_collection1247×604 277 KB

However, if I move it away from the 0,0,0 axis and reopen the collection, the collision will be displayed as rotated 90 degrees. When I run the game the collision is set up correctly (not 90 degrees).

Not sure if I am doing something wrong here or what.

collision_messed_up_collection
collision_messed_up_collection1244×654 208 KB

Oddity #2) Changing the scale on a game object with a model will increase the size of the model but not the collision.

Here is a model at normal size:

normal_size
normal_size1083×710 68.7 KB

Here is the same model at double the size but with the collision remaining at the original scale. This is how the collision is working in game too. I am confused since other models appear to work correctly. Not sure why the specific model is resulting in different collisions:

double_size
double_size1082×717 124 KB

Any help to explain or help me fix these issues would be great. Thank you!

2

Could you please share a sample project that we can take a look at?

1 Like
3

Here is the github link to the project (was too large to upload here for some reason): GitHub - DrCampbell2017/3dOddities: Help with this 3d project please! · GitHub

Sure! Here’s a sample project. It has two collections:

  • exampleCollection (shows Oddity #1 listed above)
  • scaleIssueCollection (shows Oddity #2 listed above) UPDATE: I figured this one out, I wasn’t scaling in all 3 directions, once I did that it began working correctly!

I am also having an issue with the capsule collider where it is letting the character phase into objects halfway.

in_table_issue
in_table_issue874×476 64.8 KB

I am using a lot of code from Dragosha’s light and shadow example, but I do not think that is related: GitHub - Dragosha/defold-light-and-shadows: Pack of shaders to make light and shadows in Defold.

4

When I opened the project the collision object was indeed rotated like in the screenshot, but after changing the rotation to some other value and then back to 90 again it started looking ok, no matter what I did to it. I am not able to get it to rotate incorrectly either. Can you walk me through step-by-step how I can achieve it starting from an empty project?

Ah, yes, you need uniform scaling probably, otherwise it will pick the smallest value.