Smoky Cogs

Hello Serge,

Thank you for your wonderful tutorials they have been very helpful. I have been looking all over but I have been unable to find any info about scaling in O3D. I need to be able to make a matrix of position vertices and then scale all the x’s by same factor. Do any of your tutorials address this problem?

Hi Serge

I finally got some stuff working. I have an animated character running around a garden with drag and drop plants. So happy with that.
I was wondering how difficult would it to be implement a slide bar that turns the light strength down in the scene

Also could you clear up some confusion.
OpenGL, x3d, canvas3d, vrml, U3D, standards, specifactions.
Whats the difference between them all. And what makes o3d the new and better technology to play with.

Regards

Eamonn

Hi Eamonn

I am glad you having some success. Would love to see the results, so if you have it up on a server somewhere, please send me a link

Controlling the light strength itself is trivial, but using a slider to do that might be a little bit trickier, but certainly doable. HTML doesn’t have a built-in slider if that is what you want, but there are many available resources on the net on how to implement one.

If instead, you want the slider in the o3d scene itself, then that is a little more work, but not difficult. In the 2d hud overlay, all you need to do is define the graphical elements, such as a square for the slider itself, and perhaps a thin rectangle with tick marks for the range the slider can move. Then you can create code that moves the slider (plus the internal value associated with it) when you click and drag on it, much like the same way I move the scene when clicking and dragging.

Now on to the different technologies:
OpenGL are a set of graphical libraries for computers which are pretty close to DirectX. They run on the OS itself.

X3d is a slightly older technology that is somewhat similar to what o3d does, but never really took off, and o3d does a better job these days. x3d is also based on VRML (an even older tech)

Canvas3d is the new kid on the block. The nice thing about the canvas is that it requires no plugin, but does require a browser that supports HTML5 elements. Firefox and Chrome are good candidates here. Canvas3d is the biggest competitor to O3d.

U3D stands for Universal 3D and is a file format for 3D graphics rather than a graphics engine, which the other technologies are. They are useful for PDF’s since PDF’s support thee format natively.

Hope all that helps

Hi Serge,

Thanks for the O3d tutorial, it’s a lot of helpful to us here in the office. We are a group of students trying to make real a dream here in Spain. We have translated your tutorial into spanish and we’d be pleased if you accept it as a gift, it could be interesting for a lot of people. But we have found a missing lesson in your book, we have found an explanation in the web but not so nice as your way of teaching, it’s all about how to make a collision buffer of a single room with some furniture inside of it, what we haven’t found that nobody explains at length, I think you describe something but I must say we attempted to do with no success, i hope what we have included doesn’t make angry (no artist likes tird hands) it’s the best we have found!!
So tell us your e-mail adress to send it to you and we’ll keep the contact!!
Regards,
Juanma

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