Hi,
What's the status of lib3ds these days? It doesn't seem to have had a
release in many years, but a brief glance at the mailing list archives
shows a fair bit of activity there.
Also, the following is a patch I wrote to add handling for "object
chunks" (HIDDEN etc); I originally sent this to the debian lib3ds
maintainer, but he seem to have disappeared:
lib3ds ignores various "object flag" chunks like LIB3DS_OBJ_HIDDEN
(basically all chunks with prefix "LIB3DS_OBJ_").
This is particularly annoying in the case of LIB3DS_OBJ_HIDDEN, because
many 3ds models contain hidden elements which are not intended to be
rendered (e.g., multiple copies of part of the model might be provided,
each in a different state, with only one not marked as hidden); when the
hidden parts _are_ rendered, it can screw up the result.
I've attached a patch which handles this chunks. It basically adds a
new field "obj_flags" to the Lib3dsMesh, Lib3dsCamera, and Lib3dsCamera
structures, and a new enum Lib3dsObjFlags. Each bit of the obj_flags
field corresponds to one value in Lib3dsObjFlags.
BTW, compiling lib3ds with gcc-4.1 resulted in a non-working library
(lots of strange problems, basically it didn't parse 3ds files
correctly). Compiling with gcc-3.3 worked fine.
diff -ruN -X../diff.xcl lib3ds-1.2.0/lib3ds/camera.h lib3ds-1.2.0-miles-20060404/lib3ds/camera.h
--- lib3ds-1.2.0/lib3ds/camera.h 2001-07-08 04:05:30.000000000 +0900
+++ lib3ds-1.2.0-miles-20060404/lib3ds/camera.h 2006-04-04 17:04:30.000000000 +0900
@@ -45,6 +45,7 @@
Lib3dsBool see_cone;
Lib3dsFloat near_range;
Lib3dsFloat far_range;
+ Lib3dsDword obj_flags;
};
extern LIB3DSAPI Lib3dsCamera* lib3ds_camera_new(const char *name);
diff -ruN -X../diff.xcl lib3ds-1.2.0/lib3ds/file.c lib3ds-1.2.0-miles-20060404/lib3ds/file.c
--- lib3ds-1.2.0/lib3ds/file.c 2001-08-07 19:25:43.000000000 +0900
+++ lib3ds-1.2.0-miles-20060404/lib3ds/file.c 2006-04-04 18:20:44.000000000 +0900
@@ -308,6 +308,10 @@
Lib3dsChunk c;
char name[64];
Lib3dsWord chunk;
+ Lib3dsWord obj_flags = 0;
+ Lib3dsMesh *mesh = 0;
+ Lib3dsCamera *camera = 0;
+ Lib3dsLight *light = 0;
if (!lib3ds_chunk_read_start(&c, LIB3DS_NAMED_OBJECT, io)) {
return(LIB3DS_FALSE);
@@ -322,8 +326,6 @@
switch (chunk) {
case LIB3DS_N_TRI_OBJECT:
{
- Lib3dsMesh *mesh;
-
mesh=lib3ds_mesh_new(name);
if (!mesh) {
return(LIB3DS_FALSE);
@@ -337,8 +339,6 @@
break;
case LIB3DS_N_CAMERA:
{
- Lib3dsCamera *camera;
-
camera=lib3ds_camera_new(name);
if (!camera) {
return(LIB3DS_FALSE);
@@ -352,8 +352,6 @@
break;
case LIB3DS_N_DIRECT_LIGHT:
{
- Lib3dsLight *light;
-
light=lib3ds_light_new(name);
if (!light) {
return(LIB3DS_FALSE);
@@ -365,11 +363,49 @@
lib3ds_file_insert_light(file, light);
}
break;
+
+ /* Object flag chunks */
+ case LIB3DS_OBJ_HIDDEN:
+ obj_flags |= LIB3DS_OBJF_HIDDEN;
+ break;
+ case LIB3DS_OBJ_VIS_LOFTER:
+ obj_flags |= LIB3DS_OBJF_VIS_LOFTER;
+ break;
+ case LIB3DS_OBJ_DOESNT_CAST:
+ obj_flags |= LIB3DS_OBJF_DOESNT_CAST;
+ break;
+ case LIB3DS_OBJ_DONT_RECVSHADOW:
+ obj_flags |= LIB3DS_OBJF_DONT_RECVSHADOW;
+ break;
+ case LIB3DS_OBJ_MATTE:
+ obj_flags |= LIB3DS_OBJF_MATTE;
+ break;
+ case LIB3DS_OBJ_FAST:
+ obj_flags |= LIB3DS_OBJF_FAST;
+ break;
+ case LIB3DS_OBJ_PROCEDURAL:
+ obj_flags |= LIB3DS_OBJF_PROCEDURAL;
+ break;
+ case LIB3DS_OBJ_FROZEN:
+ obj_flags |= LIB3DS_OBJF_FROZEN;
+ break;
+
default:
lib3ds_chunk_unknown(chunk);
}
}
+ /* Set the object flags; we do this after the loop so that we don't
+ depend on the chunk order. */
+ if (obj_flags) {
+ if (mesh)
+ mesh->obj_flags = obj_flags;
+ if (light)
+ light->obj_flags = obj_flags;
+ if (camera)
+ camera->obj_flags = obj_flags;
+ }
+
lib3ds_chunk_read_end(&c, io);
return(LIB3DS_TRUE);
}
@@ -762,6 +798,36 @@
return(LIB3DS_TRUE);
}
+static void
+obj_flags_write(Lib3dsDword obj_flags, Lib3dsIo *io)
+{
+ Lib3dsChunk c;
+ c.size = 6;
+ c.chunk = LIB3DS_OBJ_HIDDEN;
+ if (obj_flags & LIB3DS_OBJF_HIDDEN)
+ lib3ds_chunk_write (&c, io);
+ c.chunk = LIB3DS_OBJ_VIS_LOFTER;
+ if (obj_flags & LIB3DS_OBJF_VIS_LOFTER)
+ lib3ds_chunk_write (&c, io);
+ c.chunk = LIB3DS_OBJ_DOESNT_CAST;
+ if (obj_flags & LIB3DS_OBJF_DOESNT_CAST)
+ lib3ds_chunk_write (&c, io);
+ c.chunk = LIB3DS_OBJ_DONT_RECVSHADOW;
+ if (obj_flags & LIB3DS_OBJF_DONT_RECVSHADOW)
+ lib3ds_chunk_write (&c, io);
+ c.chunk = LIB3DS_OBJ_MATTE;
+ if (obj_flags & LIB3DS_OBJF_MATTE)
+ lib3ds_chunk_write (&c, io);
+ c.chunk = LIB3DS_OBJ_FAST;
+ if (obj_flags & LIB3DS_OBJF_FAST)
+ lib3ds_chunk_write (&c, io);
+ c.chunk = LIB3DS_OBJ_PROCEDURAL;
+ if (obj_flags & LIB3DS_OBJF_PROCEDURAL)
+ lib3ds_chunk_write (&c, io);
+ c.chunk = LIB3DS_OBJ_FROZEN;
+ if (obj_flags & LIB3DS_OBJF_FROZEN)
+ lib3ds_chunk_write (&c, io);
+}
static Lib3dsBool
mdata_write(Lib3dsFile *file, Lib3dsIo *io)
@@ -841,6 +907,8 @@
}
lib3ds_io_write_string(io, p->name);
lib3ds_camera_write(p,io);
+ if (p->obj_flags)
+ obj_flags_write (p->obj_flags, io);
if (!lib3ds_chunk_write_end(&c,io)) {
return(LIB3DS_FALSE);
}
@@ -857,6 +925,8 @@
}
lib3ds_io_write_string(io,p->name);
lib3ds_light_write(p,io);
+ if (p->obj_flags)
+ obj_flags_write (p->obj_flags, io);
if (!lib3ds_chunk_write_end(&c,io)) {
return(LIB3DS_FALSE);
}
@@ -873,6 +943,8 @@
}
lib3ds_io_write_string(io, p->name);
lib3ds_mesh_write(p,io);
+ if (p->obj_flags)
+ obj_flags_write (p->obj_flags, io);
if (!lib3ds_chunk_write_end(&c,io)) {
return(LIB3DS_FALSE);
}
diff -ruN -X../diff.xcl lib3ds-1.2.0/lib3ds/light.h lib3ds-1.2.0-miles-20060404/lib3ds/light.h
--- lib3ds-1.2.0/lib3ds/light.h 2001-07-08 04:05:30.000000000 +0900
+++ lib3ds-1.2.0-miles-20060404/lib3ds/light.h 2006-04-04 17:22:23.000000000 +0900
@@ -63,6 +63,7 @@
Lib3dsFloat ray_bias;
Lib3dsFloat hot_spot;
Lib3dsFloat fall_off;
+ Lib3dsDword obj_flags;
};
extern LIB3DSAPI Lib3dsLight* lib3ds_light_new(const char *name);
diff -ruN -X../diff.xcl lib3ds-1.2.0/lib3ds/mesh.h lib3ds-1.2.0-miles-20060404/lib3ds/mesh.h
--- lib3ds-1.2.0/lib3ds/mesh.h 2001-07-08 04:05:30.000000000 +0900
+++ lib3ds-1.2.0-miles-20060404/lib3ds/mesh.h 2006-04-04 17:04:11.000000000 +0900
@@ -110,6 +110,7 @@
Lib3dsFace *faceL;
Lib3dsBoxMap box_map;
Lib3dsMapData map_data;
+ Lib3dsDword obj_flags;
};
extern LIB3DSAPI Lib3dsMesh* lib3ds_mesh_new(const char *name);
diff -ruN -X../diff.xcl lib3ds-1.2.0/lib3ds/types.h lib3ds-1.2.0-miles-20060404/lib3ds/types.h
--- lib3ds-1.2.0/lib3ds/types.h 2001-07-08 04:05:30.000000000 +0900
+++ lib3ds-1.2.0-miles-20060404/lib3ds/types.h 2006-04-04 18:20:10.000000000 +0900
@@ -118,6 +118,19 @@
typedef struct _Lib3dsNode Lib3dsNode;
+typedef enum _Lib3dsObjFlags {
+ /* We use the prefix "LIB3DS_OBJF_" for these flags as LIB3DS_OBJ_ is
+ already used by the corresponding chunks. */
+ LIB3DS_OBJF_HIDDEN = 0x0001,
+ LIB3DS_OBJF_VIS_LOFTER = 0x0002,
+ LIB3DS_OBJF_DOESNT_CAST = 0x0004,
+ LIB3DS_OBJF_MATTE = 0x0008,
+ LIB3DS_OBJF_FAST = 0x0010,
+ LIB3DS_OBJF_PROCEDURAL = 0x0020,
+ LIB3DS_OBJF_FROZEN = 0x0040,
+ LIB3DS_OBJF_DONT_RECVSHADOW = 0x0080
+} Lib3dsObjFlags;
+
typedef union _Lib3dsUserData {
void *p;
Lib3dsIntd i;
Files ../orig/lib3ds-1.2.0/tools/3ds2m and ./tools/3ds2m differ
Files ../orig/lib3ds-1.2.0/tools/3dsdump and ./tools/3dsdump differ
Thanks,
-Miles
--
"Suppose we've chosen the wrong god. Every time we go to church we're
just making him madder and madder." -- Homer Simpson
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