Here we have the functions for each item on the hierachy: The best tags to use for large blocks of code are probably (without the spaces). Maybe you could post just the bits of code where you set up the relevant transforms. I wasn't even aware it was an issue, however, so thank you for pointing it out. I was putting those the wrong way around, however it hasn't fixed the problem. This is a common thing to get wrong, and usually results in objects not appearing where they're supposed to. Generally you want to rotate and then translate, which translates into calling glTranslate*() before glRotate*() in your code. I am indeed using those methods to form an object hierarchy (Sorry, I've been thrown into the deep end, so unfamiliar with many terms, functions etc).Īnother potential problem is order of operations. Are you using glPushMatrix() and glPopMatrix()? Proper use of these functions is usually the first step towards applying hierarchical transforms. I cant imagine that no-one has used a tree structure before, so is there anything I can do that would make my question easier to ask?īy tree method I assume you mean an object hierarchy of some sort.

If anyone has any ideas I would appreciate it.ĮDIT: I've removed the code as i reckon I might be scaring people off, obviously people are looking but not replying. The C code below can also be found here: I have attempted to play around with the rotate and translate functions but haven't come up with anything yet. So my question is does anything strike you as a good reason as to why some members of the tree are not displaying. (Also hopefully the tags work as there isn't a preview button.)

I have enclosed a Small Compilable Example below, although with openGL it appears there is no such thing as a small example. Now I know that if there is a problem with the tree then the objects wont display, however my problem is that only the top and bottom items in the tree are displayed (IE the scaled down wheel/sphere and one rim)

(In the code below the wheel is scaled extra small so I may better see the tyre)ĭue to assignment constraints I have to use a tree method of connecting the items, and am currently having the wheel -> tyre (cyclinder) -> one rim (disc) -> other disc. I modelled a wheel as a scaled sphere at first, and am now trying to add a tyre. I have a problem where I am trying to draw a unicycle.

Some graphics wont show in pspps