[leveller] Re: 64-bit STL plugin?
- From: "Ray Gardener" <rayg@xxxxxxxxxxxxxxxxxx>
- To: <leveller@xxxxxxxxxxxxx>
- Date: Sun, 9 Oct 2011 11:57:32 -0700
Okay, I did find a possible off-by-one error in the fan generator; you can
download
www.daylongraphics.com/download/usr/stl64.ltf
which has a fix.
Ray
-----Original Message-----
From: leveller-bounce@xxxxxxxxxxxxx [mailto:leveller-bounce@xxxxxxxxxxxxx]
On Behalf Of Ray Gardener
Sent: Sunday, October 09, 2011 11:29 AM
To: leveller@xxxxxxxxxxxxx
Subject: [leveller] Re: 64-bit STL plugin?
I did a test here; the binary STL output will write the number of triangles
to a 32-bit value at offset 80 (50 hex). In this case, I got 290,266.
Four extra triangles likely corresponds to an extra triangle in each bottom
fan. My visual inspections of the models don't show anything, so the extra
triangles are probably overlapping redundantly.
The last step of your calculation was off; it should be 1558 = 2 x (477 +
301) + 2. There are as many triangles in the fan as there are gridposts,
because after all the vertices are joined there is one last inner triangle
that has to be made to fill in the connector edge.
I'll debug it here and see if I can find the four excess triangles.
Thanks,
Ray
-----Original Message-----
From: leveller-bounce@xxxxxxxxxxxxx [mailto:leveller-bounce@xxxxxxxxxxxxx]
On Behalf Of Chris Dordoni
Sent: Saturday, October 08, 2011 8:56 PM
To: leveller@xxxxxxxxxxxxx
Subject: [leveller] Re: 64-bit STL plugin?
Hi Ray
I looked back at a few files I processed with the updated STL plugin in
Win32 and discovered that I had processed them through Netfabb Studio Basic
(free) to close them. My recall that the STL from the updated plugin was
closed as it came out of Leveller in the Win32 version was wrong. I
uninstalled the Win64 Leveller and reinstalled the Win32 Leveller with the
STL plugin update and ran a test just to be sure. So the 32 and 64 bit
versions are doing the same thing.
I think the problem is that there are just a few extra polygons that are
preventing the object from being manifold, at least by the number of
vertices and triangles that are reported compared to what should be there.
The resolution of my test object is 477 x 301 pixels, these are my
calculations so you can check them:
285600 = 2(476 x 300) front face triangles
3104 = 4(476 + 300) edge triangles
1554 = 2(476 + 300) + 2 back face triangles
-------------------------------------------------------------
290258 = total triangles, compare to Netfabb report 290266 triangles before
and 290262 triangles after repair Somewhere I missed accounting for 4
triangles?
143577 = 477 x 301 front face vertices
1556 = 2(477 + 301 - 2) + 4 back face vertices
-------------------------------------------------------------
145133 = total vertices , compare to Netfabb reports 145133 vertices before
and 145133 after repair.
It's an easy fix with Netfabb Studio Basic, and as long as the files
don't get extremely large (Netfabb is not yet Win64)
Chris
On 10/7/2011 10:39 PM, Ray Gardener wrote:
> There's usually some good viewer tools to check the resulting mesh and its
> normals. My only misgiving is that the triangles that connect the hi-res
> edge to the low-res bottom quad use a simple triangle fan generator that
> makes lots of very long, narrow triangles as heightfield resolution
> increases. Other than that, I can't think of anything.
>
> Ray
>
>
> -----Original Message-----
> From:leveller-bounce@xxxxxxxxxxxxx [mailto:leveller-bounce@xxxxxxxxxxxxx]
> On Behalf Of Chris Dordoni
> Sent: Friday, October 07, 2011 7:12 AM
> To:leveller@xxxxxxxxxxxxx
> Subject: [leveller] Re: 64-bit STL plugin?
>
> OK, I will continue to examine what I did to to see if I can find
something
> wrong in my process.
>
>
> On 10/7/2011 9:57 AM, Ray Gardener wrote:
>> It all checks out here.
>>
>>
>> -----Original Message-----
>> From:leveller-bounce@xxxxxxxxxxxxx
[mailto:leveller-bounce@xxxxxxxxxxxxx]
>> On Behalf Of Chris Dordoni
>> Sent: Friday, October 07, 2011 6:46 AM
>> To:leveller@xxxxxxxxxxxxx
>> Subject: [leveller] 64-bit STL plugin?
>>
>> Hi Ray,
>>
>> Is the 64-bit version of the STL plugin the same version as the 32-bit?
>>
>> I'm getting some results here that indicate it may be missing the
> correction
>> you recently made to joining the front polys to the back polys so the
> object
>> is manifold.
>>
>> Chris
>>
>>
>>
>>
>>
>>
--
tel: 508 341 5403
website:http://www.concept-4d.com/websites/Chris_Dordoni_website.html
gmail chat:chris.dordoni@xxxxxxxxx
skype name: chrisdordoni
Other related posts:
