 | | Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
|
|
(...) I think a full worked through example would do the specs a lot of good. If I understand right the line 1 c x y z a b c d e f g h i part.dat transforms any point by the operation (u, v, w)->(x+a*u+b*v+c*w, y+d*u+e*v+f*w, z+g*u+h*v+i*w) With it (...) (19 years ago, 22-Aug-07, to lugnet.cad)
|
| |
| | Re: *** LDView Version 3.2 Released ***
|
|
(...) That's the first I've heard of new performance problems in 3.2. I don't think I got any reports of that for the 3.2 Beta, and the 3.2 final is only bug fixes. It certainly runs fine on the computers I've tested it on. Can you copy the first (...) (19 years ago, 22-Aug-07, to lugnet.cad)
|
| |
| | Re: *** LDView Version 3.2 Released ***
|
|
(...) Thank you Travis. Is it just me or is this version unusable slow? Drawing anything takes a good few seconds of 100% CPU whereas the same model and settings were almost instant in previous versions. I can go back to some previous build if it (...) (19 years ago, 22-Aug-07, to lugnet.cad)
|
| |
| | Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
|
|
(...) I thought I'd add a clarification to the above. A quick look at LDView's (URL) Change History> file will show that I only added support for spaces in submodel filenames in version 3.0. Furthermore, I listed it as an addition, not a bug fix, (...) (19 years ago, 22-Aug-07, to lugnet.cad, FTX)
|
| |
| | Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
|
|
(...) That's true. However, unless I'm badly mistaken, in addition to the xyz1 being at the end, you also need the other parameters to be in the proper direction in order to get the results that the LDraw library wants. The following two matrices (...) (19 years ago, 22-Aug-07, to lugnet.cad)
|
| |
| | Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
|
|
(...) Yes, but look where the x, y, and z are. The example matrix is transposed vs the "standard" one shown in OpenGL text. If you swap the rows and columns in the above matrix, you'll get the OpenGL one. It's an alternate way of expressing a 3D (...) (19 years ago, 22-Aug-07, to lugnet.cad)
|
| |
| | Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
|
|
(...) I think we'll just include two examples of how the data would go into a matrix in the two different directions and leave it at that. At this point, I think the best thing would be to add something like the following to the currently proposed (...) (19 years ago, 22-Aug-07, to lugnet.cad)
|
| |
| | Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
|
|
(...) The OpenGL 2.1 specification: page 23 Vertex Arrays "Matrices are loaded into these slots in column major order." page 43 Matrices LoadMatrix takes a pointer to a 4 × 4 matrix stored in column-major order as 16 consecutive floating-point (...) (19 years ago, 22-Aug-07, to lugnet.cad)
|
| |
| | Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
|
|
(...) You guys are both wrong, OpenGL is NOT column major. This is one of the biggest mistakes I keep hearing people repeat about OpenGL. The API doesn't care if you use column major or row major matrices, it just expects an array of 16 floats with (...) (19 years ago, 21-Aug-07, to lugnet.cad)
|
| |
| | Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
|
|
(...) Hi again. What I meant was, I am confused by the (apparent) difference in what the *current* spec says on this issue, and what the new proposed spec says. If you will look at the current spec and scroll down near the end to the Line Format (...) (19 years ago, 22-Aug-07, to lugnet.cad)
|
| |
| | Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
|
|
(...) From the standpoint of OpenGL, it uses row-major ordering. There are two ways to draw a transformation matrix. OpenGL uses the following (array offsets shown after): A D G X 0 4 8 12 B E H Y 1 5 9 13 C F I Z 2 6 10 14 0 0 0 1 3 7 11 15 (...) (19 years ago, 22-Aug-07, to lugnet.cad)
|
| |
| | Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
|
|
(...) I came across the *current* LDraw file spec here: (URL) the matrix example is using column-major ordering. So now I'm really confused. Does the current spec use column-major, and the new spec is proposing to change it? Or is the current spec (...) (19 years ago, 22-Aug-07, to lugnet.cad)
|
| |
| | *** LDView Version 3.2 Released ***
|
|
LDView 3.2 is now available for download from the LDView downloads page here: (URL) Please note that the translations have not yet been updated to work with this release, and translations created for version 3.1 will refuse to load. The 3.2 (...) (19 years ago, 22-Aug-07, to lugnet.announce, lugnet.cad, FTX) !!
|
| |
| | Re: Question about LDraw.org Library Header Specification
|
|
(...) Yes. (...) Yes to that too. I've fixed both of these problems. Hopefully I didn't introduce new once (the content system on ldraw.org can be finicky). --Travis (19 years ago, 22-Aug-07, to lugnet.cad)
|
| |
| | Question about LDraw.org Library Header Specification
|
|
At this url: (URL) you scroll down to the first Examples header (in bold) there's this line: 0 !CATEGORY Animal 0 !KEYWORDS Sting, Poison, Adventurers, Egypt Is there supposed to be a line break between "Animal" and "0"? Also, a little later in the (...) (19 years ago, 22-Aug-07, to lugnet.cad)
|
| |
| | Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
|
|
(...) I'm new to this community, and am just learning 3D graphics, but I will comment on this as someone who will eventually use this file format to read in and render these parts in 3D. 1. Character encoding - for a file spec, not specifying this (...) (19 years ago, 21-Aug-07, to lugnet.cad)
|
| |
| | Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
|
|
(...) I think the original suggestion that we mention that it is in row-major format is valid. I agree that the fact that OpenGL (almost certainly one of the top two most used 3D APIs on the planet) uses column major format is a good reason to (...) (19 years ago, 21-Aug-07, to lugnet.cad)
|
| |
| | Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
|
|
(...) The "so-what" would be that I, as someone who will eventually read in these files to create OpenGL renderings of them, would expect the matrices to be in column-major order, unless explicitly stated otherwise. Rob (19 years ago, 21-Aug-07, to lugnet.cad)
|
| |
| | Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
|
|
(...) Umm, so what? LDraw is not, and should not, be dependent on OpenGL. Having worked with transformation matrix in both formats, I find the row-major format much easier to hand-edit than column-major organization. At least for LDraw-type usage (...) (19 years ago, 21-Aug-07, to lugnet.cad)
|
| |
| | Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
|
|
(...) Page 16 of the OpenGL spec, v2.1 states: "Only convex polygons are guaranteed to be drawn correctly by the GL." Rob (19 years ago, 21-Aug-07, to lugnet.cad)
|
