i’m quite a new programmer in opengl. i want to model a liver and other
irregular shape objects using primitive opengl commands, without relying
on available higher API and software such as Maya, 3DMax, etc.
i would like to see some sample in C/C++ implementation. any one can
please help ? thanks a lot !
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what do you mean by sample code ? code that shows you how to render
primitives using opengl ? i could provide you with that. i could mail it
to you… let me know…
yup, i would like some sample code on rendering irregular shape 3D
object, eg. liver, phone, animal, etc. which is modeled using OpenGL
basic command only, not relying on the available 3D modeler such as
would it be feasible ? afterwards, i need to animate the objects
thx for the help !
:) :D :)
I have three points:
that’s about it :)
i don’t suggest it as well (read it over on nutty.org, too:D)
use a modeler..
The reason you dont want to handcode the object is because anything
larger than a cube requires a great number of lines of code. And they
all look like this:
glVertex3f(1.0f, 1.0f, 1.0f);
glVertex3f(3.0f, 246.0f, 234.0f);
glVertex3f(246.0f, 234.0f, 2465.0f);
glVertex3f(45.0f, 543.0f, 65.0f);
glVertex3f(1.0f, 54.0f, 634.0f);
glVertex3f(234.0f, 524.0f, 1.0f);
glVertex3f(2654.0f, 234.0f, 1.0f);
glVertex3f(1.0f, 352.0f, 1.0f);
Or something to that degree, but with less spastic numbers. Now imagine
trying to come up with the verticies for a 1000 poly model. (thats 1000
triangles, so if you were to do it with GL_TRIANGLES, 3000 glVertex3f()
calls) What a nightmare, huh? So you need to let the artist make the
object, and instead write a class that will load in that object and draw
it efficiently. This is much easier to do.
I dont know why you dont want to use models made by professional
modeling programs, but perhaps its because you want to make them
yourself and you dont have the money for 3DS Max? First of all, there
are many models people have made which they have given for free use on
the Internet. Apart from that, there are also openSource modelers that
you can use for free.
Hope this helps.
thanks a lot for the reply. in the end, i decided to use 3dmax to model
the objects i want, then use a opengl loader for 3dmax format file.
(give up… nobody recommend me to use opengl itself =p )
initially, i thought that by using opengl itself to model the object, i
don’t have to convert the 3dmax / maya codes into opengl to be
manipulated. the project i want to do is to make real time user
interaction on the model.
so by using opengl to model the object itself, it enables me to store
the object data in my data structure, and render it faster in C++/C#
right now, i’m still not clear about the project design and feasibility
by converting 3dmax model into opengl. anyone would like to comment or
suggest something ?
:blink: :rolleyes: :)
There is no way to draw anything in OpenGL, without OpenGL commands. The
easy way is to use the data from the model file, and pass it to OpenGL
via appropriate commands. The hard way, and never used way, is to
manually do it.
Here’s a .3ds loading openGL dooda:
Need to sleep,
Here’s a really good tutorial on loading .3ds files in C (I plan to use
it too) :D
Sorry, look below (delete this post please)
thx for the link, i’ll certainly read through it
Ok, two more (that I think are better):