Collision with box no longer working?

[LobsterKing]

Hello everyone!

I finally bought MMF2 and converted my project from TGF1 to MMF2.

I used transparent colours for some obstacle backgrounds, and used the "collision with box" option so these backgrounds objects are considered as solid blocks (so that even the transparent parts block the characters).

Now that the game is converted to MMF2, I noticed the transparent colour is no longer blocking movement, even though the option "collision with box" is checked. What's going on? Am I insane?


I'm using MMF2 standard, build R255.

[ChrisBurrows]

Fine collision?

[LobsterKing]

You mean fine detection? That's for active objects. Background objects have the option collision with box, and it doesn't seem to do anything.

[LobsterKing]

Update on the situation! This particular issue only seems to happen if the layer containing my character and the backdrop object is not in layer #1. When I set to layer #1, the collision with box propertie is handled properly. On any other layer, my character moves through any transparent pixel as if collision with box was off.

I suspect a dreadful bug and not a spiffy feature. Can anyone confirm if this is intended or not?

[Danny]

IIRC, there was some issues in 255 with backdrops and layer collissions, try updating to 256 and see if that works. If you register your serial on the forum you will gain access to the MMF2 Beta Lounge containing the very latest version. There was a LOT of fixes between 255 and 256 so I'm not 100% but it's certainly worth a shot.

To do this, click Settings in the top right hand corner of this page and add to My Products.

[AyreGuitar]

LobsterKing - I'm pretty sure that collisions only work on the same layer, eg an Active on Layer 2 won't collide with an Obstacle on Layer 1 but will with an Obstacle on Layer 2. Layers are generally used for parallax scrolling, where the background moves slower than the foreground. Of course, I could be wrong!

[Shawn]

LobsterKing - I'm pretty sure that collisions only work on the same layer, eg an Active on Layer 2 won't collide with an Obstacle on Layer 1 but will with an Obstacle on Layer 2. Layers are generally used for parallax scrolling, where the background moves slower than the foreground. Of course, I could be wrong!

This is correct, objects have to be on the same layer for collisions.

[LobsterKing]

LobsterKing - I'm pretty sure that collisions only work on the same layer, eg an Active on Layer 2 won't collide with an Obstacle on Layer 1 but will with an Obstacle on Layer 2. Layers are generally used for parallax scrolling, where the background moves slower than the foreground. Of course, I could be wrong!

Yes, I knew that one! And it's exactly because I added parallax backgrounds that I started to have problems. The layer system didn't exist on TGF1 and I always wanted to add parallax :P

I only use two layers: everything is on the first one and the other is only a background picture with a parallax effect. If I want the background... in the back, it must be on layer 1, while everything else is on layer 2. But the collision with box option only works for layer 1. In other words : The transparent pixels of obstacles on the same layer as the actives won't block the actives unless this layer is layer 1!


@Danny : I checked the latest version threads, it looks like there are still some collision bugs in the latest release. I'll wait patiently for the final release of 256

I just want the devs to be aware of this issue.

[Yves]

I've just tested an active object in fine collision mode and a backdrop object in box collision mode on various layers, that seems OK. Could you send me a very small example please?

PS: there is no background collision issues with the build 256.34 and anyway this problem was a totally different issue.

[LobsterKing]

Could you send me a very small example please?

Well, I've got news.
I created a new app in MMF2 to demonstrate the issue, probably just like you did, Yves - and this time there was no issue at all! The collision with box option worked for all layers.

Since the game I'm working on was initially ported from TGF1, I re-created my example on TGF1, then ported it to MMF2, and added a new layer. Now the collision with box option didn't work for layer 2, like in my game.

I searched for differences between each example, and found that the example initially created with MMF2 had "Handle background collisions even out of window" checked for each of its frames. Checking this option fixes it, and collision with box now works everywhere.
I'll just enable it for each level in my game! It's a bit strange it has an effect on collision with box detection on some layers.


****


Here's the example file (the one ported from TGF1) : boxtest4.mfa
Two layers : one with the red actives and obstacles, and one with a transparent gradient.
Press space to skip to the other frame, where the layers are switched.
The red blocks should be blocked by the empty space between the two green blocks, but it's obviously not what is happening on the 1st frame.

You can edit the game to check "handle bg collisions... etc" and the issue will disappear.