ZModeler forum

Oleg wrote: ↑Sun Nov 19, 2023 11:57 pm it looks like you have bad physics data on a model. Make sure to assign some-what real "Mass" values on COL objects. Also, the local axes of every COL object is the center of mass - you might need to move axes lower for chassis and slightly toward the front part. It looks like center of mass is right above the rear wheels or even behind them.

Oleg wrote: ↑Mon Nov 20, 2023 10:56 am attach a screenshot of Left viewport with "COL" state toggled on (and L0/L1... togged off), so only collision objects are visible in viewport.

object's axes are moved with "Move" tool. You need to toggle an option "Move axes only" before moving.

Oleg wrote: ↑Mon Nov 20, 2023 2:18 pm Move entire scene (geometry, collisions and dummies) to the right and a bit up. You can move just root dummy node with Move tool and "Affect children" option toggled on. You can select this node in hierarchy view with Alt+click on visibility icon. To move "pre-selected" objects, disable automatic selection ("Auto" button in the bottom of ZM window) and enable "Selected" button so the "Move" tool will act on selected element rather than on hovered element.

Once you move entire scene this use "Display\local axes\Reset to world" tool on main scene dummy node (hide everything except this dummy to be able to click on it); and apply to "chassis" object too.

Then use Move tool in "Move axes only" to move chassis' collision local axes to green/blue point like on this scheme:
Screenshot 2023-11-21 011258.png

Oleg wrote: ↑Mon Nov 20, 2023 2:18 pm Move entire scene (geometry, collisions and dummies) to the right and a bit up. You can move just root dummy node with Move tool and "Affect children" option toggled on. You can select this node in hierarchy view with Alt+click on visibility icon. To move "pre-selected" objects, disable automatic selection ("Auto" button in the bottom of ZM window) and enable "Selected" button so the "Move" tool will act on selected element rather than on hovered element.

Once you move entire scene this use "Display\local axes\Reset to world" tool on main scene dummy node (hide everything except this dummy to be able to click on it); and apply to "chassis" object too.

Then use Move tool in "Move axes only" to move chassis' collision local axes to green/blue point like on this scheme:
Screenshot 2023-11-21 011258.png

Oleg wrote: ↑Wed Nov 22, 2023 4:11 am none of that. entire scene (L0 models and collisions, everything) should be moved. then "reset axes" on main dummy node and chassis object.

Oleg wrote: ↑Wed Nov 22, 2023 3:47 pm no. the hierarchy's topmost element. it should have a model's name (or model's name with "_hi" on the end). "chassis" is a child of this node. So, this root node and "chassis" should have local axes at 0,0,0 point ("Reset to world" tool does this).

The object shown as primitive (has no geometry) is called a "dummy node" in ZModeler. By default, it is a blue box shape, but can have different shape/size/color (adjusted in properties).

Oleg wrote: ↑Thu Nov 23, 2023 5:20 am Hmmm... may be you've moved way too far.
Also, what is the Mass value in user-defined options on chassis[COL] object?

Oleg wrote: ↑Thu Nov 23, 2023 5:20 am Hmmm... may be you've moved way too far.
Also, what is the Mass value in user-defined options on chassis[COL] object?

Oleg wrote: ↑Thu Nov 23, 2023 8:51 am have you tried to load original bus model to compare scene position to yours? and to compare physics values (Mass, E) ?

Oleg wrote: ↑Thu Nov 23, 2023 10:59 am I think your converted bus should be somewhat similar in position relative to original bus. Vertical position of entire scene could have impact on physics in game. That is why following the guideline of original bus is suggested.

Oleg wrote: ↑Thu Nov 23, 2023 10:59 am I think your converted bus should be somewhat similar in position relative to original bus. Vertical position of entire scene could have impact on physics in game. That is why following the guideline of original bus is suggested.

Oleg wrote: ↑Thu Nov 23, 2023 11:42 am the issue might be related to some collision bumping out of the bus to the ground, so bus "skids" on road with this collision object instead of riding on wheels. in particular, you can make some light poles and road signs to fall onto the ground and try to push them with some vehicle under the bus to see whether these objects pass through or stuck.