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solvespace/src/importmesh.cpp at master · Sebidev/solvespace · GitHub
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importmesh.cpp
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//
-----------------------------------------------------------------------------
//
Triangle mesh file reader. Reads an STL file triangle mesh and creates
//
a SovleSpace SMesh from it. Supports only Linking, not import.
//
//
Copyright 2020 Paul Kahler.
//
-----------------------------------------------------------------------------
#
include
"
solvespace.h
"
#
include
"
sketch.h
"
#
include
<
vector
>
#
define
MIN_POINT_DISTANCE
0.001
//
we will check for duplicate vertices and keep all their normals
class
vertex
{
public:
Vector p;
std::vector<Vector> normal;
};
static
bool
isEdgeVertex
(vertex &v) {
unsigned
int
i,j;
bool
result =
false
;
for
(i=
0
;i<v.
normal
.
size
();i++) {
for
(j=i;j<v.
normal
.
size
();j++) {
if
(v.
normal
[i].
Dot
(v.
normal
[j]) <
0.9
) {
result =
true
;
}
}
}
return
result;
}
//
This function has poor performance, used inside a loop it is O(n**2)
static
void
addUnique
(std::vector<vertex> &lv, Vector &p, Vector &n) {
unsigned
int
i;
for
(i=
0
; i<lv.
size
(); i++) {
if
(lv[i].
p
.
Equals
(p,
MIN_POINT_DISTANCE
)) {
break
;
}
}
if
(i==lv.
size
()) {
vertex v;
v.
p
= p;
lv.
push_back
(v);
}
//
we could improve a little by only storing unique normals
lv[i].
normal
.
push_back
(n);
};
//
Make a new point - type doesn't matter since we will make a copy later
static
hEntity
newPoint
(EntityList *el,
int
*id, Vector p) {
Entity en = {};
en.
type
= Entity::Type::
POINT_N_COPY
;
en.
extraPoints
=
0
;
en.
timesApplied
=
0
;
en.
group
.
v
=
462
;
en.
actPoint
= p;
en.
construction
=
false
;
en.
style
.
v
= Style::
DATUM
;
en.
actVisible
=
true
;
en.
forceHidden
=
false
;
en.
h
.
v
= *id + en.
group
.
v
*
65536
;
*id = *id+
1
;
el->
Add
(&en);
return
en.
h
;
}
//
check if a vertex is unique and add it via newPoint if it is.
static
void
addVertex
(EntityList *el, Vector v) {
if
(el->
n
<
15000
) {
int
id = el->
n
;
newPoint
(el, &id, v);
}
}
static
hEntity
newNormal
(EntityList *el,
int
*id, Quaternion normal, hEntity p) {
//
normals have parameters, but we don't need them to make a NORMAL_N_COPY from this
Entity en = {};
en.
type
= Entity::Type::
NORMAL_N_COPY
;
en.
extraPoints
=
0
;
en.
timesApplied
=
0
;
en.
group
.
v
=
472
;
en.
actNormal
= normal;
en.
construction
=
false
;
en.
style
.
v
= Style::
NORMALS
;
//
to be visible we need to add a point.
//
en.point[0] = newPoint(el, id, Vector::From(0,0,0));
en.
point
[
0
] = p;
en.
actVisible
=
true
;
en.
forceHidden
=
false
;
*id = *id+
1
;
en.
h
.
v
= *id + en.
group
.
v
*
65536
;
el->
Add
(&en);
return
en.
h
;
}
static
hEntity
newLine
(EntityList *el,
int
*id, hEntity p0, hEntity p1) {
Entity en = {};
en.
type
= Entity::Type::
LINE_SEGMENT
;
en.
point
[
0
] = p0;
en.
point
[
1
] = p1;
en.
extraPoints
=
0
;
en.
timesApplied
=
0
;
en.
group
.
v
=
493
;
en.
construction
=
true
;
en.
style
.
v
= Style::
CONSTRUCTION
;
en.
actVisible
=
true
;
en.
forceHidden
=
false
;
en.
h
.
v
= *id + en.
group
.
v
*
65536
;
*id = *id +
1
;
el->
Add
(&en);
return
en.
h
;
}
namespace
SolveSpace
{
bool
LinkStl
(
const
Platform::Path &filename, EntityList *el, SMesh *m, SShell *sh) {
dbp
(
"
\n
Link STL triangle mesh.
"
);
el->
Clear
();
std::string data;
if
(!
ReadFile
(filename, &data)) {
Error
(
"
Couldn't read from '%s'
"
, filename.
raw
.
c_str
());
return
false
;
}
std::stringstream
f
(data);
char
str[
80
] = {};
f.
read
(str,
80
);
if
(
0
==
memcmp
(
"
solid
"
, str,
5
)) {
//
just returning false will trigger the warning that linked file is not present
//
best solution is to add an importer for text STL.
Message
(
_
(
"
Text-formated STL files are not currently supported
"
));
return
false
;
}
uint32_t
n;
uint32_t
color;
f.
read
((
char
*)&n,
4
);
dbp
(
"
%d triangles
"
, n);
float
x,y,z;
float
xn,yn,zn;
std::vector<vertex> verts = {};
for
(
uint32_t
i =
0
; i<n; i++) {
STriangle tr = {};
//
read the triangle normal
f.
read
((
char
*)&xn,
4
);
f.
read
((
char
*)&yn,
4
);
f.
read
((
char
*)&zn,
4
);
tr.
an
=
Vector::From
(xn,yn,zn);
tr.
bn
= tr.
an
;
tr.
cn
= tr.
an
;
f.
read
((
char
*)&x,
4
);
f.
read
((
char
*)&y,
4
);
f.
read
((
char
*)&z,
4
);
tr.
a
.
x
= x;
tr.
a
.
y
= y;
tr.
a
.
z
= z;
f.
read
((
char
*)&x,
4
);
f.
read
((
char
*)&y,
4
);
f.
read
((
char
*)&z,
4
);
tr.
b
.
x
= x;
tr.
b
.
y
= y;
tr.
b
.
z
= z;
f.
read
((
char
*)&x,
4
);
f.
read
((
char
*)&y,
4
);
f.
read
((
char
*)&z,
4
);
tr.
c
.
x
= x;
tr.
c
.
y
= y;
tr.
c
.
z
= z;
f.
read
((
char
*)&color,
2
);
if
(color &
0x8000
) {
tr.
meta
.
color
.
red
= (color >>
7
) &
0xf8
;
tr.
meta
.
color
.
green
= (color >>
2
) &
0xf8
;
tr.
meta
.
color
.
blue
= (color <<
3
);
tr.
meta
.
color
.
alpha
=
255
;
}
else
{
tr.
meta
.
color
.
red
=
90
;
tr.
meta
.
color
.
green
=
120
;
tr.
meta
.
color
.
blue
=
140
;
tr.
meta
.
color
.
alpha
=
255
;
}
m->
AddTriangle
(&tr);
Vector normal = tr.
Normal
().
WithMagnitude
(
1.0
);
addUnique
(verts, tr.
a
, normal);
addUnique
(verts, tr.
b
, normal);
addUnique
(verts, tr.
c
, normal);
}
dbp
(
"
%d vertices
"
, verts.
size
());
int
id =
1
;
//
add the STL origin and normals
hEntity origin =
newPoint
(el, &id,
Vector::From
(
0.0
,
0.0
,
0.0
));
newNormal
(el, &id,
Quaternion::From
(
Vector::From
(
1
,
0
,
0
),
Vector::From
(
0
,
1
,
0
)), origin);
newNormal
(el, &id,
Quaternion::From
(
Vector::From
(
0
,
1
,
0
),
Vector::From
(
0
,
0
,
1
)), origin);
newNormal
(el, &id,
Quaternion::From
(
Vector::From
(
0
,
0
,
1
),
Vector::From
(
1
,
0
,
0
)), origin);
BBox box = {};
box.
minp
= verts[
0
].
p
;
box.
maxp
= verts[
0
].
p
;
//
determine the bounding box for all vertexes
for
(
unsigned
int
i=
1
; i<verts.
size
(); i++) {
box.
Include
(verts[i].
p
);
}
hEntity p[
8
];
p[
0
] =
newPoint
(el, &id,
Vector::From
(box.
minp
.
x
, box.
minp
.
y
, box.
minp
.
z
));
p[
1
] =
newPoint
(el, &id,
Vector::From
(box.
maxp
.
x
, box.
minp
.
y
, box.
minp
.
z
));
p[
2
] =
newPoint
(el, &id,
Vector::From
(box.
minp
.
x
, box.
maxp
.
y
, box.
minp
.
z
));
p[
3
] =
newPoint
(el, &id,
Vector::From
(box.
maxp
.
x
, box.
maxp
.
y
, box.
minp
.
z
));
p[
4
] =
newPoint
(el, &id,
Vector::From
(box.
minp
.
x
, box.
minp
.
y
, box.
maxp
.
z
));
p[
5
] =
newPoint
(el, &id,
Vector::From
(box.
maxp
.
x
, box.
minp
.
y
, box.
maxp
.
z
));
p[
6
] =
newPoint
(el, &id,
Vector::From
(box.
minp
.
x
, box.
maxp
.
y
, box.
maxp
.
z
));
p[
7
] =
newPoint
(el, &id,
Vector::From
(box.
maxp
.
x
, box.
maxp
.
y
, box.
maxp
.
z
));
newLine
(el, &id, p[
0
], p[
1
]);
newLine
(el, &id, p[
0
], p[
2
]);
newLine
(el, &id, p[
3
], p[
1
]);
newLine
(el, &id, p[
3
], p[
2
]);
newLine
(el, &id, p[
4
], p[
5
]);
newLine
(el, &id, p[
4
], p[
6
]);
newLine
(el, &id, p[
7
], p[
5
]);
newLine
(el, &id, p[
7
], p[
6
]);
newLine
(el, &id, p[
0
], p[
4
]);
newLine
(el, &id, p[
1
], p[
5
]);
newLine
(el, &id, p[
2
], p[
6
]);
newLine
(el, &id, p[
3
], p[
7
]);
for
(
unsigned
int
i=
0
; i<verts.
size
(); i++) {
//
create point entities for edge vertexes
if
(
isEdgeVertex
(verts[i])) {
addVertex
(el, verts[i].
p
);
}
}
return
true
;
}
}
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