Why are enemy Flipbooks not loading on mobile?

anonymous_user_4da56dc1 · March 22, 2016, 2:17am

Hi. I’m building a little Paper 2D game. My main character flipbooks, and spritemaps load, display and function correctly.

The issue at hand is, the enemy flipbooks/sprites don’t display, but the enemy does function. Basically, I now have invisible enemies.

It’s set to is visible. So what else can be causing this?

anonymous_user_4da56dc1 · March 22, 2016, 5:16pm

Hi guys. Looking for some advice on how to troubleshoot this issue? Thank you

anonymous_user_a91ffdda · March 23, 2016, 10:07am

Can you share your flipbook graphics?

Are the sprites in the flipbooks(sheet or otherwise) powers of 2 like 1024 x 1024?

Are the enemies rotated so that they face perpendicular to the screen?

Do you ONLY get this issue on mobile or do you get it playing in editor too?

anonymous_user_4da56dc1 · March 25, 2016, 8:12pm

Hey there!

I only get the issue on mobile. I’ve tested and replicated the issue on a Note 5, iPhone 4s, 5, and 6 Plus. Same issue occurs on each device.

One sec, gonna put some screen shots together for ya.

anonymous_user_a91ffdda · March 26, 2016, 1:41pm

Thank you for sharing your assets and blueprints.

What are the pixel dimensions of the sprites in your flipbook?
Mobile is very particular about the pixel dimensions of textures, sprites included.

Mind sharing a screen shot of the sprite in your level too?

anonymous_user_4da56dc1 · March 27, 2016, 9:20pm

anonymous_user_4da56dc1 · March 27, 2016, 9:22pm

Here you go. A screenshot of the sprite details. Happy Easter!

anonymous_user_4da56dc1 · March 28, 2016, 7:35pm

Also, check out these details in the sprite blueprint. Where and how should I configure the dimensions?

anonymous_user_4da56dc1 · March 28, 2016, 9:38pm

I’ve uploaded a clip of the game simulating correctly on the PC, and another clip of the sprite disappearing on the mobile device.

I rearranged the characters so I can see an enemy on load, and I discovered it looks like the enemy disappears when he’s supposed to turn around. What usually causes that?

anonymous_user_4da56dc1 · March 28, 2016, 9:47pm

When you stream the Issue on Mobile video, notice the Enemy and his Heart Health disappear when he’s supposed to just turn around.

anonymous_user_4da56dc1 · March 29, 2016, 12:59am

Check out the problem on my Note 5

[VIDEO Issue on Mobile][1]

[VIDEO Correctly working in the editor][2]

[2]:

anonymous_user_4da56dc1 · March 30, 2016, 6:51pm

Hi everybody. I still haven’t resolved this. Your help is appreciated!

anonymous_user_a91ffdda · March 31, 2016, 1:23pm

Hi, thank you for sharing but wow. This is really strange.
I’d still like to know how many pixels tall and wide the sprite atlas/sprite sheet for your enemy is.

But judging from your stream, you can get your sprites to appear for a brief moment which shouldn’t happen at all if the textures weren’t powers of 2.

Have you tried converting your sprite sheet textures to another material and applying that material to a static mesh?
If you don’t have any static meshes, add the starter assets to your project.

anonymous_user_a08c0bf2 · March 31, 2016, 6:23pm

,

Could you please upload your logs from your device? To gather your logs, please follow these steps:

Go to: C:\android-sdk-windows\tools\Monitor.bat
Run Monitor.bat
Hook your device up to your computer
Run the program on the device
Gather the logs by highlighting them and saving them

If you do not highlight the logs first, they will not save.

Please also test in 4.11.0 and see whether or not this issue is still occurring. You may need to upload your assets as well.

Thanks!

anonymous_user_4da56dc1 · March 31, 2016, 7:08pm

Hi . Here are some more details.

The texture I extracted my sprites from is 256x256.

Taking your advice I deleted my sprites and flipbook, and re-extracted all sprites at 32x32. Also, of course, I then made a new walking flipbook. The issue still occurs.

I also tried different materials and meshes on the BP instead, and the same issue occurs.

Today I discovered the following error when debugging the game live on my Android: E/libEGL: called unimplemented OpenGL ES API

So, I’m starting to think it’s an OpenGL ES issue since it only happens on mobile. And all 3 iPhones and Android I tested.

Any idea how to resolve this error?.. E/libEGL: called unimplemented OpenGL ES API

anonymous_user_4da56dc1 · April 1, 2016, 8:52pm

Hi . I appreciate your help!

I tried in 4.11 and the same issue occurs.

I made two logs from Android Device Monitor while running the game. Let me know if there’s anything else I can provide to help resolve the issue.

Thank you!

[Error Log][1]

[Verbose Error Log][2]

[2]:

anonymous_user_a91ffdda · April 3, 2016, 2:23pm

Wow that’s way beyond my scope, sorry I can’t be of any more help. I hope you get this resolved!

anonymous_user_a08c0bf2 · April 4, 2016, 3:35pm

Could you verify that you’ve enabled OpenGL ES 2.0 on your project? And also provide me with the logs from your iOS device by [following this link][1]. If you happen to have a sample project that you’ve replicated this in, please upload the project and provide me with the link. I’d also like to know whether or not this is occurring in 4.11.

Thanks!

A new, community-hosted Unreal Engine Wiki - Announcements - Epic Developer Community Forums

anonymous_user_4da56dc1 · April 4, 2016, 7:50pm

Thanks . I’ll get onto getting you those logs and sample.

Is there a way I can send you the sample project with a private link?

Also, how do I verify that OpenGL ES 2.0 is enabled?

Thanks!

anonymous_user_4da56dc1 · April 4, 2016, 8:11pm

This is the only thing I could find in relation to ES2. Is this what you were looking for whern it comes to OpenGL?