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  transformgroups and lights  (Read 722 times)
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Offline hawkwind

Junior Devvie




Java games rock!


« Posted 2004-04-23 14:04:36 »

Should a light in a transformgroup move as the transformgroup is modified??  Currently my lights stay right where I set the initial position.
Offline Bombadil

Senior Devvie





« Reply #1 - Posted 2004-04-23 18:24:55 »

Quote
Should a light in a transformgroup move as the transformgroup is modified??  Currently my lights stay right where I set the initial position.

What kind of light source? Because there are several ones.
AmbientLight and DirectionalLight don't move because they are present on the entire scenery.

{Edit}  For PointLight and SpotLight please see Yuri's explanation below.


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Offline Yuri Vl. Gushchin

Senior Devvie




Speak Java!


« Reply #2 - Posted 2004-04-24 05:50:27 »

Hi,

Quote
However PointLight and SpotLight will move, in case you move the transformgroup where they're in.


No, currently in Xith3D all the light positions and directions are defined in VWorld coordinate space, without taking into account transformations introduced by TransformGroups, so behavior desribed by hawkwind is correct.

I know this is not correct behavior and most probably will change in future. The original explanation from David on how this works can be found here: http://www.java-gaming.org/cgi-bin/JGNetForums/YaBB.cgi?board=xith3d;action=display;num=1063563461

Yuri

Yuri Vl. Gushchin
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Offline Bombadil

Senior Devvie





« Reply #3 - Posted 2004-04-24 06:15:09 »

Quote
Hi,

No, currently in Xith3D all the light positions and directions are defined in VWorld coordinate space, without taking into account transformations introduced by TransformGroups, so behavior desribed by hawkwind is correct.

I know this is not correct behavior and most probably will change in future.

Thanks Yuri for the clarification + explanation.

I use lights in your way (you've already answered that question some time ago) but illustrate the point light with a sphere which I move via transformgroup. Now I messed up them quoting from memory... (Getting older and forgetfully...)
Offline William Denniss

JGO Coder


Projects: 2


Fire at will


« Reply #4 - Posted 2004-04-24 22:06:46 »

I have posted this as an FAQ:  http://xith.org/tiki-view_faq.php?faqId=1#q16

I welcome everyone to suggest questions in tiki - I can then easily approve them and they become part of the faq.

Will.

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