Second Life Forums Archive - Havok4 and sculpties?

Okiphia Rayna

DemonEye Benefactor

Join date: 22 Sep 2007

Posts: 2,103

12-09-2007 15:13

I was reading the update on the Havok4 Beta, and was seeing what it is supposed to do and one was

From: someone

Volume Detection
Volume detection is now the exact shape of the object instead of the bounding box
Uniformly scaled spheres are implicit (roll like spheres instead of faceted blocks)
Shapes are quantized
The colliding shape may differ slightly from the aparent shape
The errors should be smaller than the collision tolerance threshold, and thus not noticeable
Shape errors would be most noticable for large objects if they are noticable at all

Does this mean that sculpties will be able to be walked on and such, instead of having non-phantoms be big boxes?

If so then YAYYYY!!! lol.if not, then what's that mean?

_____________________

Owner of DemonEye Designs Custom Building and Landscaping
Owner and Blogger, Okiphia's Life
http://okiphiablog.blogspot.com/

Chosen Few

Alpha Channel Slave

Join date: 16 Jan 2004

Posts: 7,496

12-09-2007 15:25

I doubt it has any bearing on sculpties. As I understand it, the sculpt shape is just a client-side graphical effect. The server has no knowledge that the sculpty is anything other than a sphere (in the same way that the server has no knowledge that a flexi is anything but a rigid cube or cylinder). I'd love to find out I'm wrong about that, but I don't think I am.

What I think it's actually saying is that the physics engine will more accurately track collisions in accordance with the actual shapes of prims, rather than the rougher shapes of their bounding boxes. It still won't correlate perfectly, but it will be a lot closer. And rounded surfaces will behave physically as if they're actually round, rather than as faceted polygons. In theory, that would mean if you role a ball down a hill, it will roll smoothly instead of bouncing from corner to corner, facet to facet.

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Seifert Surface

Mathematician

Join date: 14 Jun 2005

Posts: 912

12-09-2007 17:30

Andrew Linden has talked about wanting to get a better approximation for the physics of sculpties than the current one (which is a torus of the appropriate size I believe), but that's not in the current Havok 4.

The round physics behaviour is only for actual spheres. I think if you change it a bit (cut, make it ellipsoidal etc.) then it goes back to faceted.

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2G!tGLf 2nLt9cG

Okiphia Rayna

DemonEye Benefactor

Join date: 22 Sep 2007

Posts: 2,103

12-09-2007 17:37

Thanks much ^_^

too bad.. would be awesome wouldn't it?

Eventually...

_____________________

Owner of DemonEye Designs Custom Building and Landscaping
Owner and Blogger, Okiphia's Life
http://okiphiablog.blogspot.com/

Carl Temin

Registered User

Join date: 29 Sep 2006

Posts: 39

Sculpties, Havok 4 and sit problems

02-06-2008 05:37

Hello all

One major problem i have noticed with Havok 4 is that objects made from Sculpties that you sit on can trap the avi inside the bounding box of the sculpty. This means that the Ridable birds I have made from sculpties trap their riders and the object has to be taken into inventory or deleted before the rider can dismount. I tried hard to produce the large prim required in Wings3d such that it had a smaller bounding box but to no avail. If anyone knows how I can produce a large sculpty of complex shape with a smaller bounding box I would be most grateful.

Kind regards

Carl

Jamay Greene

Registered User

Join date: 2 Jan 2007

Posts: 75

02-06-2008 05:42

Take your sculpt map into an image editor and extend the color range all the way out. For example, your green values should extend from 0 to 255, the same with the red and blue values.

Carl Temin

Registered User

Join date: 29 Sep 2006

Posts: 39

Extending Colour values

02-07-2008 06:21

Thank you for that, I would if i knew how. would you care to expand on how one might do that. I use PSP 10 as a graphics program, anyone here know how I might start.

Kind regards

Carl

Al Sonic

Builder Furiend

Join date: 13 Jun 2006

Posts: 162

02-07-2008 16:24

From: Carl Temin

Extending Colour values – Thank you for that, I would if I knew how. Would you care to expand on how one might do that? I use PSP 10 as a graphics program. Anyone here know how I might start?

Look for the Levels tool. Ctrl-L may be one way to get to it. You'll see a graph of how much the image uses all levels of brightness. Select the individual Red (or Green or Blue) channel, and move the sliders to just surround the entire used range of levels. I think "Auto" does this automatically. Then just do the same for the other two channels, and hit OK.

_____________________

If I said a thing ya don't understand, lemme know. I too love it when info is easy to read

.

Havok4 and sculpties?
Okiphia Rayna DemonEye Benefactor Join date: 22 Sep 2007 Posts: 2,103	12-09-2007 15:13 I was reading the update on the Havok4 Beta, and was seeing what it is supposed to do and one was From: someone Volume Detection Volume detection is now the exact shape of the object instead of the bounding box Uniformly scaled spheres are implicit (roll like spheres instead of faceted blocks) Shapes are quantized The colliding shape may differ slightly from the aparent shape The errors should be smaller than the collision tolerance threshold, and thus not noticeable Shape errors would be most noticable for large objects if they are noticable at all Does this mean that sculpties will be able to be walked on and such, instead of having non-phantoms be big boxes? If so then YAYYYY!!! lol.if not, then what's that mean? _____________________ Owner of DemonEye Designs Custom Building and Landscaping Owner and Blogger, Okiphia's Life http://okiphiablog.blogspot.com/
Chosen Few Alpha Channel Slave Join date: 16 Jan 2004 Posts: 7,496	12-09-2007 15:25 I doubt it has any bearing on sculpties. As I understand it, the sculpt shape is just a client-side graphical effect. The server has no knowledge that the sculpty is anything other than a sphere (in the same way that the server has no knowledge that a flexi is anything but a rigid cube or cylinder). I'd love to find out I'm wrong about that, but I don't think I am. What I think it's actually saying is that the physics engine will more accurately track collisions in accordance with the actual shapes of prims, rather than the rougher shapes of their bounding boxes. It still won't correlate perfectly, but it will be a lot closer. And rounded surfaces will behave physically as if they're actually round, rather than as faceted polygons. In theory, that would mean if you role a ball down a hill, it will roll smoothly instead of bouncing from corner to corner, facet to facet. _____________________ . Land now available for rent in Indigo. Low rates. Quiet, low-lag mainland sim with good neighbors. IM me in-world if you're interested.
Seifert Surface Mathematician Join date: 14 Jun 2005 Posts: 912	12-09-2007 17:30 Andrew Linden has talked about wanting to get a better approximation for the physics of sculpties than the current one (which is a torus of the appropriate size I believe), but that's not in the current Havok 4. The round physics behaviour is only for actual spheres. I think if you change it a bit (cut, make it ellipsoidal etc.) then it goes back to faceted. _____________________ -Seifert Surface 2G!tGLf 2nLt9cG
Okiphia Rayna DemonEye Benefactor Join date: 22 Sep 2007 Posts: 2,103	12-09-2007 17:37 Thanks much ^_^ too bad.. would be awesome wouldn't it? Eventually... _____________________ Owner of DemonEye Designs Custom Building and Landscaping Owner and Blogger, Okiphia's Life http://okiphiablog.blogspot.com/
Carl Temin Registered User Join date: 29 Sep 2006 Posts: 39	Sculpties, Havok 4 and sit problems 02-06-2008 05:37 Hello all One major problem i have noticed with Havok 4 is that objects made from Sculpties that you sit on can trap the avi inside the bounding box of the sculpty. This means that the Ridable birds I have made from sculpties trap their riders and the object has to be taken into inventory or deleted before the rider can dismount. I tried hard to produce the large prim required in Wings3d such that it had a smaller bounding box but to no avail. If anyone knows how I can produce a large sculpty of complex shape with a smaller bounding box I would be most grateful. Kind regards Carl
Jamay Greene Registered User Join date: 2 Jan 2007 Posts: 75	02-06-2008 05:42 Take your sculpt map into an image editor and extend the color range all the way out. For example, your green values should extend from 0 to 255, the same with the red and blue values.
Carl Temin Registered User Join date: 29 Sep 2006 Posts: 39	Extending Colour values 02-07-2008 06:21 Thank you for that, I would if i knew how. would you care to expand on how one might do that. I use PSP 10 as a graphics program, anyone here know how I might start. Kind regards Carl
Al Sonic Builder Furiend Join date: 13 Jun 2006 Posts: 162	02-07-2008 16:24 From: Carl Temin Extending Colour values – Thank you for that, I would if I knew how. Would you care to expand on how one might do that? I use PSP 10 as a graphics program. Anyone here know how I might start? Look for the Levels tool. Ctrl-L may be one way to get to it. You'll see a graph of how much the image uses all levels of brightness. Select the individual Red (or Green or Blue) channel, and move the sliders to just surround the entire used range of levels. I think "Auto" does this automatically. Then just do the same for the other two channels, and hit OK. _____________________ If I said a thing ya don't understand, lemme know. I too love it when info is easy to read .

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Havok4 and sculpties?