See trough half-sphere

serengeor · Post by **serengeor** » Sat Jun 06, 2009 8:20 pm

I've modeled simple cube and I cut out rectangle in which I put half sphere.
in blender it looks nice but

...
When I load it in irrlicht its invisible from one side and there aren't collisions when object falls on it.
My model

In Mesh viewer:

from inside:

How could i fix this ?

Lonesome Ducky · Post by **Lonesome Ducky** » Sat Jun 06, 2009 8:27 pm

Turn off backface culling.

serengeor · Post by **serengeor** » Sat Jun 06, 2009 8:46 pm

It worked for rendering.
but collisions still don;t work.
I'm using irrnewt and irrlicht 1.5 . (btw collisions work on other maps like quake one in examples)

Lonesome Ducky · Post by **Lonesome Ducky** » Sat Jun 06, 2009 9:02 pm

I guess collision doesn't like backfacing triangles either. Try going back into the modeler and flipping the triangles that can not be seen. This way, they should be seen in the program and affect collision.

Acki · Post by **Acki** » Sat Jun 06, 2009 10:38 pm

Lonesome Ducky wrote:Try going back into the modeler and flipping the triangles that can not be seen. This way, they should be seen in the program and affect collision.

I agree with Lonesome Ducky here, because you can see it from inside the cube, but not from the outside, so the faces are showing in the wrong direction...

but it's strange that they seem to be right orientated inside Blender ???

(backface culling is not an option, because you still won't see the faces then, but only the backfaces)

joshcryer · Post by **joshcryer** » Sun Jun 07, 2009 7:41 am

Yep, that's the problem. Select the spherical section in Blender and click "flip normals" in the edit pane. If you turn on the normals you'll find that they're facing the wrong way.

(double sided has *no effect* in Blender export to Irrlicht, if you want a double sided object you have to duplicate it in place and flip the normals of the duplication)

BlindSide · Post by **BlindSide** » Sun Jun 07, 2009 4:19 pm

Another alternative is to select the entire mesh in Blender (In edit mode) and press Ctrl-N, then Recalculate Normals Outside.

Acki · Post by **Acki** » Sun Jun 07, 2009 4:57 pm

ahhh, so Blender creates double sided faces (I don't use Blender) !?!?!

in this case it isn't strange then...

Midnight · Post by **Midnight** » Sun Jun 07, 2009 5:23 pm

Acki wrote:ahhh, so Blender creates double sided faces (I don't use Blender) !?!?!
in this case it isn't strange then...

It's ok acki even though you aren't qualified to answer this question as well as joshcryer it won't stop you from getting your post count out of this thread.

btw acki when are you going to actually "release" something that isn't stamped and sealed by the acki brand?

don't get me wrong acki I like your devotion you just bug me. and I swear that is a dick he's holding

Acki · Post by **Acki** » Sun Jun 07, 2009 7:34 pm

and I don't care about anything a noob who is proud to post a crappy/simple hello world example into the code snippets forum says...

if that's the best you can do I have only compassion for you !!!

I won't get down to your level (I wonder who is able to get that low)...
try to offend other people, I won't reply to any post from you now...

happilylazy · Post by **happilylazy** » Mon Jun 08, 2009 7:27 am

If you need some help, don't spit on people. Trust me, you are going to need their help sometime.

Just select that half-sphere in some program and flip normals.

serengeor · Post by **serengeor** » Mon Jun 08, 2009 12:39 pm

Well the problem is solved by flipping faces.
I'm such a noob at modeling