first of all , thanks for your presentation, I like it !!
actually , i’m trying to use xtext in my project , so i need to see some examples first to get ready !
So , can you make the chess example available for us?
thank you for answering

Best regards

What is “Center” that script saying ?
Center:

I have two models and i have no success draw it correctly in space.
I’ve tried glTranslatef to “Center” and glScalef by “Scale by” before rendering - but my models located in space at the wrong coordinates.

How can I draw 2 models on their coordinates same as in 3dMax?

thanks,

Thanks for answer. Do you have a plan make script working with some textures ?

I’m trying to implement some automatic test generation using xText, xPand and MWE. I managed to create code files but I wanna create them in a organized package structure. Do you know how can I create packages using those tecnologies?

Thank you for all,

Cheers,

and my code to draw it:

glPushMatrix();
glBindTexture(GL_TEXTURE_2D, textures[13]);
glVertexPointer(3, GL_FLOAT, 0, cubeVerts);
glTexCoordPointer(2, GL_FLOAT, 0, cubeTexCoords);
glDrawArrays(GL_TRIANGLES, 0, cubeNumVerts);
glPopMatrix();

I have been having problems getting the UV texture coordinates to work.
Here is a screen shot of what it looks like in Maya: http://imgur.com/z2Ica.png
and what it looks like on the iPhone: http://imgur.com/A1alQ.png

Does anyone know how this could be fixed?
Thanks in advance for any help

But what if the object 2 or more textures?
thanks.

I made a small change to this so that it interleaves the vertex data in one contiguous array, according to http://developer.apple.com/iphone/library/documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/Performance/Performance.html

obj2opengl.pl:
http://docs.google.com/leaf?id=0B3MMs33O0RexZDUzZDU1ZjItMjRlZi00OGQwLThkOTktN2RkYWM4MzNiMDM3&hl=en

Example output (cube.h):
http://docs.google.com/leaf?id=0B3MMs33O0RexMGY0YTI0NjAtY2E1MC00MGYwLWIxM2EtMGRmYzExMzE0ODUz&hl=en

Example draw (note the required stride constant):

glVertexPointer(3, GL_FLOAT, cubeStride, cubeVerts);

glNormalPointer(GL_FLOAT, cubeStride, cubeNormals);

glDrawArrays(GL_TRIANGLES, 0, cubeNumVerts);

Http://www.hundertliegestuetze.de

should be:
print OUTFILE “glTexCoordPointer(2, GL_FLOAT, 0, “.$object.”TexCoords);\n”
if $numTexture > 0;

It stops glTexCoordPointer appearing in comment.

Nice script though!

your are absolutely right. The normals will be transformed (even scaled) according to your matrix. If you are an iPhone developer have a look at the GLGravity example to learn about lights and OpenGL. Also, this tutorial seems to introduce lights and normals quite extensively: http://www.falloutsoftware.com/tutorials/gl/gl8.htm

I’m a complete newbie when it comes to open gl, so pardon my ignorance.

But when I create a simple object with normals, and render it all, as per your examples. If I then place a light above the object, and then rotate say a cube. It seems to me that as the cube rotates around the axis, the backside of it becomes dark when facing the light, rather then the side facing away form the light becomes dark.

Do I need to recalculate or transform the normals for the light to be correct?

I’m doing a push and pop call, then translate the cube I’m drawing. I would have thought that the face facing the light would become lighter. Isn’t that what the normals are for?

could you please provide your obj file so I can try to reproduce your error?

I wondered if you could help me. I created an object in Carrara 6 pro and exported to wavefont obj file. I ran your script and I got “Illegal division by zero at ./obj2opengl.pl line 294″ I checked this and it seemed to be related to scale, so i specified -noScale and it appeared to work. However upon further inspection the header file was in fact invalid and contained nothing like the expected format, instead just a copy of the original obj file. I’m new to all of this, so forgive my ignorance but do you have any idea what I’m doing wrong?

Thanks in advance for any help

Regards

Thanks!

-bash: ./obj2opengl.pl: Permission denied

Keep up the great work!

Ryan

Loading the corresponding image file is another story, though. If you are not familiar with OpenGL ES and texture mapping these links might be helpful:
http://iphonedevelopment.blogspot.com/2009/05/opengl-es-from-ground-up-part-6_25.html
http://web.me.com/smaurice/AppleCoder/iPhone_OpenGL/Entries/2009/4/1_OpenGL_ES_05_-_Texture_Mapping_Our_Square.html

/ the converter produces a weird bug when skipping number values and leaving only commas in the array definition when the model is not in expected format, I guess; however when I exported the same model with triangles only, it works perfectly /

however, since I am a complete noob in this field I even don’t know if something like this makes sense, but is it possible to automatically apply a corresponding texture to a model defined like this in xcode? if so - how ? - does there exist a corresponding apple tutorial/concept which can be easily adopted for this ?
thank you very much!
r.

I’m afraid I cannot make this work open source. Feel free to ask questions on a conceptual level, though. I’ll be glad to give answers.

Tom.

Tom,
I am not sure what you are asking for. The water effect uses the idea of metaballs and a derivation of marching squares to convert particles that comply to some rules to a fluid area. One of these rules is gravity where the actual vector is given by the data of the accelerometer. In the mentioned paper Matthias Müller subsums gravity under “external forces”. Does this make sense?