6th June 2008, 03:42 PM | #1 |
Junior Member
Junior member
Join Date: Jun 2008
Posts: 6
|
object with 2 or more centres
Is AC3D able to make an object with 2 centres trying to draw complex machinery
like push rods and bushings |
7th June 2008, 05:03 PM | #2 |
Senior Member
Professional user
Join Date: Mar 2005
Location: Phoenix, AZ
Posts: 917
|
Re: object with 2 or more centres
I don't think you can have two centers in one object, but you can combine more than one object into a group, if that's helpful.
|
8th June 2008, 07:28 PM | #3 |
Junior Member
Junior member
Join Date: Jun 2008
Posts: 6
|
Re: object with 2 or more centres
i know i can make a group that has multi centres one per object
i'm trying to build a pivot point and or a liner motion out of a crankshaf need to know if i can lock a plane i'm working on a software fix if i can get my math right that is |
9th June 2008, 09:46 AM | #4 |
Senior Member
Professional user
Join Date: Mar 2005
Location: Phoenix, AZ
Posts: 917
|
Re: object with 2 or more centres
Just curious, are you trying to generate a plane constraint for export reasons, or to assist in modeling?
Something else that might (or might not) be helpful, the "Move Toward" plug-in. It has source code, too: http://supercoldmilk.com/ac3dplug/movetoward.html If you are only looking for the constraint for modeling (won't help if you're writing an exporter) this trick sometimes works: AC3D will constrain to the major axis if you hold down the control key. If you have a plane that's on an odd angle, one thing you can do is rotate the entire model so that the plane you want to constrain to is aligned to an axis, then move your object using the axis constraint with the control key, then rotate the whole thing back to it's original position. This trick works well for planar-mapping sloped objects, too. |
9th June 2008, 10:23 PM | #5 |
Junior Member
Junior member
Join Date: Jun 2008
Posts: 6
|
Re: object with 2 or more centres
i'm try to draw a simple crank and piston
that i can export as a x file useing it in a darkbaick porgam as a prop would like to just rotate the carank angle and have the rest of mecanisum work as it would if real ie the piston travels in a strait line without limb angle changes in the sofware |
10th June 2008, 01:51 AM | #6 |
Senior Member
Professional user
Join Date: Mar 2005
Location: Phoenix, AZ
Posts: 917
|
Re: object with 2 or more centres
Nifty!
Won't that take more than two points though? For a full crankshaft with pistons attached--assuming the crank is driving the piston heads as well as the rods--wouldn't you really need a full kinematics setup? |
12th June 2008, 11:27 PM | #7 |
Junior Member
Junior member
Join Date: Jun 2008
Posts: 6
|
Re: object with 2 or more centres
i'm not trying to modle a moter per say
i'm trying to modke a vibrating feered it uses excentric bearings to move a metal box up and forwoard about 60 times per sec it sets on bushing arms basicly i would like to know if ac3D can constraine a limb (as Dark basic sees it) to a given motion based on the input from the parent limb (or group) so as the "crank" turns can i make the group(or limb) not turn with it but pivit to stay in a strait line motion i'v done it with software math .....LOTS OF TRIG slow thing down like to know if ac3D can do it for me |
17th June 2008, 05:54 PM | #8 |
Senior Member
Professional user
Join Date: Mar 2005
Location: Phoenix, AZ
Posts: 917
|
Re: object with 2 or more centres
Not that I know of.
In fact, I'm not sure of too many file formats that will export constraints that way... most will save skeletons, but obj\x\etc don't do constraints AFAIK. I believe Collada format will, but only with the physics extensions, and I don't think there's an exporter for that. What format are other DarkBasic users using to do the same thing? |
17th June 2008, 08:35 PM | #9 |
Junior Member
Junior member
Join Date: Jun 2008
Posts: 6
|
Re: object with 2 or more centres
far as i know no one else its trying too do exactly what i'm trying
dose any cad program let you put constraints on any object i'm trying to draw a drive chain now will see how much math it takes to make look real but would be nice if the object did it for me i'v made the piston work with math |
17th June 2008, 08:38 PM | #10 |
Junior Member
Junior member
Join Date: Jun 2008
Posts: 6
|
Re: object with 2 or more centres
i'v made the piston work with math
looks some what convinsing |
Tags |
centre |
|
|