OpenGL model

Kamac · Sep 9, 2011

Hi.

I saw Jim made some exporter to .model.

Since he didn't release it yet (if he will ever release it), is there any other possibility to load a 3d model into OpenGL?

Jim Brown · Sep 11, 2011

See if this method works (Rotate first then Translate) ..

B4X:

gl.PushMatrix
gl.Rotate(0.5 , 0,1,0)
gl.Translate(0,0,-6)
gl.PopMatrix

Kamac · Sep 12, 2011

Uhm

I get your basic idea, but i can't implement it

You mean, rotate it and then pull back to 0,0,0 position or wut?

Mikie · Sep 12, 2011

Jim,

Are you trying to create a game?

By the way Jim, thanks for turning me on to b4a.

Mikie

Jim Brown · Sep 12, 2011

Kamac said:
Uhm. I get your basic idea, but i can't implement it. You mean, rotate it and then pull back to 0,0,0 position or wut?

Does this article help? ->GL 3D transformations

Kamac · Sep 12, 2011

Yes, it's very helpful, but i know that.

But my problem is different, have a look at the .apk attached, to see what do i mean.

I can rotate properly around player's Y axis, but only on position 0.0,0.0,0.0, after i move forward, he starts to rotate around some circle around the 0.0,0.0,0.0 point.

Jim Brown · Sep 12, 2011

>> Are you trying to create a game?
Hi Mikie,
I had in mind of creating something similar to My Paper Plane 2 in the Android Market. Its a personal favourite of mine. I still need additional OpenGL functionality though (such as collisions between objects)

@Kamac - No APK attached, but do you have any source code example?

Kamac · Sep 12, 2011

Sure.

B4X:

Sub glsv_Draw(gl As GL1)
   gl.glClearColor(0.1,0.35,0.6,1)
   gl.glClear(Bit.Or(gl.GL_COLOR_BUFFER_BIT, gl.GL_DEPTH_BUFFER_BIT))
   ' cube - textured
   gl.glLoadIdentity : gl.glScalef(0.5,0.5,0.5)
   gl.glTranslatef(0.0,-1.2,distZ)
   gl.glRotatef(rotX,0.0,0,0.0)
   gl.glRotatef(rotY,0,1,0.0)
   'gl.glRotatef(rotY,0,1,distZ)
   GLObject_Draw(obj1,gl)
   GLObject_Draw(obj2,gl)
   GLObject_Draw(skyboxx,gl)
   
   DrawTrees(gl)
   DrawObjects(gl)
End Sub

I believe here lays the problem.

B4X:

   gl.glLoadIdentity : gl.glScalef(0.5,0.5,0.5)
   gl.glTranslatef(0.0,-1.2,distZ)
   gl.glRotatef(rotX,0.0,0,0.0)
   gl.glRotatef(rotY,0,1,0.0)

These commands "position my camera" in the world (so actually they move the whole world i guess)

Link to the application: http://www.speedyshare.com/files/30290412/scenetest.apk

Kamac · Sep 13, 2011

Could you help me, Jim ?

alwaysbusy · Sep 13, 2011

Thanks Jim for the conversion tool. Does it support animated .x files?

Kamac · Sep 13, 2011

Does it support animated .x files?

From my poor knowledge, it doesn't.

Anyone has some tutorials on rotating camera around it's Y axis?

Jim Brown · Sep 13, 2011

> Thanks Jim for the conversion tool. Does it support animated .x files?
alwaysbusy,
There is no animation support (yet). I have not looked into how best to implement the frames of animation data

Kamac
I believe this is the sort of thing you are trying to achieve?
I used glGluLookAt to get the desired behaviour. See attached OpenGLRotateExample.zip

> --- Run the demo. You should see a red barrel on the left and green barrel to the right
> --- Slide finger horizontally to rotate around objects

B4X:

Sub glsv_Draw(gl As GL1)
       ......
   ' reset the scene
   gl.glLoadIdentity
   ' ===================
   ' CAMERA
   ' ===================
   ' set camera to 'look' at certain position
   ' EYE 0,6,9   CENTER 0,0,0   VECTOR 0,1,0
   gl.gluLookAt(0,6,9 , 0,0,0 , 0,1,0)
   ' perform rotation in Y axis
   gl.glRotatef(rotY,0,1,0)
   ' ===================
   ' draw first object
   ' ===================
   gl.glPushMatrix
   gl.glTranslatef(1.1,0,distZ)
   gl.glColor4f(0.6,1,0.6 , 1) ' green barrel colour
   GLObject_Draw(obj1,gl)
   gl.glPopMatrix
   ' ===================
   ' draw second object
   ' ===================
   gl.glPushMatrix
   gl.glColor4f(1,0.2,0.2 , 1) ' red barrel colour
   gl.glTranslatef(-1.1,0,distZ)
   GLObject_Draw(obj2,gl)
   gl.glPopMatrix
End Sub

Kamac · Sep 13, 2011

> --- Slide finger horizontally to rotate around objects

No, no

I want to avoid that.

The easiest would be, if you would check out my application.

I want to make normal movement, forward, backwards, rotate left, rotate right, but it isn't working

Just look at the app:

scenetest apk

Jim Brown · Sep 14, 2011

Your link is broken

Have a look at my new example though. There are two move methods there which let you move around a scene

Move via sliding in all directions
This is basically a doom-style move (WASD) if you follow me?
Sliding left/right or forward/back moves you around the scene without rotation

Move via rotate Y and slide Z
This moves your around by sliding forward and back but rotating for left/right
If this second method does not behave as you expect swap the order of the commands as indicated ** here:

B4X:

   '   "Move via sliding in all directions"
   If tog_MoveMethod.Checked=False Then
      gl.glTranslatef(mX,yHeight,mY)
   Else
      ' "Move via rotate Y and slide Z"
      gl.glRotatef(-mX,0,1,0)                        <--- Swap these **
      gl.glTranslatef(0,yHeight,mY)                <--- Swap these **
   End If

Kamac · Sep 15, 2011

Your link is broken

#(&#% speedyshare.

Thanks for the example, i'll try it out :icon_clap:

grobi71 · Dec 30, 2011

converter does not work for me

Hallo,

i tried to make my own 3d model with blender and exported it as directx .x File
i tried to open it in the converter but got the following error:
Mesh index not found in .x model

blender version 2.61
Directx export from Chris Forste Version 2.12

after closing the error Message i can see the cube without texture.

also i tried DeleD 3d Editor version 2.45 CE. After export to Directx format and opening in ModelUtil1.0 it opens without any error, but also without texture.

Also it is only possible to export one Object at a time.If i use a .x file with 2 or more Objects it shows only one Object in ModelUtil1.0

Can i only use Wings3d?
What do i wrong ?

happy new year
Grobi

boten · Mar 13, 2012

Have NO experience in OpenGL, so I tried the sample you provided. Worked fine.
Then I tried to alter the dicemap.png. Resized it by a factor of 2 (256x256) and it worked fine.
Then I tried a factor of 3 (384x384) and a strange thing happened:
On the emulator it worked fine, but on the phone (SGS) all the surfaces were WHITE! - any explanation?

BTW - Can you provide a model & map for a dice with NO bevels - Just 6 sides?

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