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Member Since 14 Nov 2007
Offline Last Active Nov 21 2012 05:28 AM

Topics I've Started

Atrix / Problem with Textures

03 April 2012 - 02:33 AM

Hello @ All,

i am working on a SpaceSim with Android (later porting to IOS) ,
3 Weeks ago i ported the Engine from Open GL ES 1.0 to 2.0. (Android Level 10. (2.3)

Everything works fine while testing on all devices i can get .... till i tested on a Motorola Atrix / Mobile and Tablet.

It seems that the Tegra Chip eating up my Textures...researching in google shows me only
that this chipset got a different compressions... but i dont know what to do with this information.

Some of the Textures looks like stranges lines , an some are working perfekt
(the "Schrift.png" is a 512x512png is working perfekt (its my GUI and Fonts))
the planet textures are disturbed (Only on this Device)
the effect mostly hit the mimapped larger textures (all are power of 2 and largest is 1024x512)

The geometry of the objects seems all to be working good, depth buffers,position of objekts...

Maybe an error in my GL ES 2.0 texture loading Code:

Can anybody help me?

Greetings Theri :)

GLES20.glGenTextures(max_textures_loading, textures, 0);

public void  loadtextur(int textur_id,Context context)



    int resource=R.drawable.icon;


    if (textur_id==0)    resource=R.drawable.schrift;

    if (textur_id==2)    resource=R.drawable.planet_1;

    if (textur_id==2)    resource=R.drawable.raster;


    if (textur_id==3)    resource=R.drawable.verlauf;


    if (textur_id==5)    resource=R.drawable.sun;

    if (textur_id==6)    resource=R.drawable.shadow;

    if (textur_id==7)    resource=R.drawable.sterne_1;

    if (textur_id==8)    resource=R.drawable.sterne_2;

    if (textur_id==9)    resource=R.drawable.sterne_3;

    if (textur_id==10)   resource=R.drawable.sterne_4;

    if (textur_id==11)   resource=R.drawable.sterne_5;

    if (textur_id==12)   resource=R.drawable.sterne_6;


    if (textur_id==13)   resource=R.drawable.nebel_1;

    if (textur_id==14)   resource=R.drawable.nebel_2;

    if (textur_id==15)   resource=R.drawable.nebel_3;

    if (textur_id==16)   resource=R.drawable.nebel_4;

    if (textur_id==17)   resource=R.drawable.nebel_5;

    if (textur_id==18)   resource=R.drawable.nebel_6;


    if (textur_id==19)   resource=R.drawable.hintergrund;



    if (textur_id==20)   resource=R.drawable.wolken;

    if (textur_id==21)   resource=R.drawable.planet_1;

    if (textur_id==23)   resource=R.drawable.planet_3;

    if (textur_id==24)   resource=R.drawable.planet_4;




    BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();

    bitmapOptions.inScaled = false;


    bitmap = BitmapFactory.decodeResource(context.getResources(), resource, bitmapOptions);

    bitmap = Bitmap.createBitmap(bitmap, 0, 0,bitmap.getWidth(), bitmap.getHeight());






    boolean mipmap_ok=true;


    if (textur_id==0) mipmap_ok=false;



    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textures[textur_id]);


   // Only a try/test

    // GLES20.glPixelStorei(GLES20.GL_PACK_ALIGNMENT, 4);

	 //GLES20.glPixelStorei(GLES20.GL_PACK_ALIGNMENT, 1);




    // MipMap Linear als Standart




    if (mipmap_ok==false)










    // Wrap Repeat als Standart




    GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);


    if (mipmap_ok==true)









    // Erzeuge MipMaps








    if (textures[textur_id] == 0)


		   throw new RuntimeException("Error loading texture.");




SpaceGame Background Stars via Skybox/Dome?

12 June 2011 - 02:27 AM

Hello @all,

i am work on some ideas for an 3d space game..at this point its about the stars background.

(its not a problem to create a starfield jpg with gimp2), more the problem is.. the background

is dynamicly created when entering the system/orbit of an planet.. but how to

handle the background in 3d..

at moment i create 6 face in FBO Textures with view angle of 90 (rendered each with same scenario,but different view angels)

and put them in a skybox

and i always still see the edges of the skybox..is there any other method i can use?

do you have a hint/link for an good page about rendering planets/athomsperic effects etc?

(at the end the planets surfaces/clouds is created dynamicly..to get a giant amount a different planets)

anybody remember StarGilder2 in the 1988 :)

much thanks :)

Vector back to glrotate question

29 May 2011 - 05:45 AM

Hello @ All,

i got an working 3 Vector rotation system (X;Y;Z) for an space sim game,

but now i want to set the rotation in opengl for the objects(and later the camera)

orientate the object to the z orientation vector is very easy with this formula:

//vx,vy,vz holds the Z vector

float wi_r1=get_winkel(vx,vz); //get angle of vx,vz)
float wi_r2=get_winkel( get_entf_2d(vx,vz),vy ); //get angle of distance (vx,vz)/vy

gl.glRotatef(wi_r1, 0, 1, 0);
gl.glRotatef(wi_r2+90, 1, 0, 0);

this is working absolutly perfect

but my problem is the roll
gl.glRotatef(roll, 0, 0, 1);

how do i calculate an float value from the Vx/Vy/Vz vectors the setup for the opengl


the glulookat function set up my camera 100% correct (even with roll by giving the up vector)

now i only need the same thing to the painted objects



glu.gluPerspective( pvi, asp, near,far );


glu.gluLookAt(vector[0],vector[1],vector[2], // origin the Z Vector
0,0,0, //targeting the zero origin
vector[6],vector[7],vector[8]); //up vector (Y)


and here i need the same like the glulookat do...


// rotate to vetctors

much greetings

Posted Image

JOGL2 // loading custom mipmaps // how?!

28 March 2011 - 06:10 AM

Hello @all,

i try to use my own custom mipmaps for an textur atlas in JOGL2 for (i hope) avoiding the texture bleeding thing.

my problem is that i dont know how to load in JOGL2 for example a

--> ground_level1.png into ground_texture(mip-level1)

->> ground_level2.png into mip-level2.......

the auto-mipmap produces the bleeding border around ... but there is no tutorial for jogl2 for doing that mipmap stuff.

thanks for all help :) theri

3d to 2d problem

14 November 2007 - 03:02 AM

Hello i write an 3d engine for Flash and so i have to do all the 3d stuff for myself i am on a litte problem with the mathematics screen_x=((vx*400)/vz)+screen_x_center; screen_y=((vy*400)/vz)+screen_y_center; this works perfect, but when my triangles calculated with this reach the vector vz<=0 then i got crazy artefacts how i had to change the math to get correct triangles problem with artefacts the quads/triangles on the sky are also wrong (they belong to the floor and are normally behind me/viewcam ) what can i do? greetings (and sorry for my bad english)