/
read.go
79 lines (66 loc) · 2.11 KB
/
read.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
package splat
import (
"encoding/binary"
"io"
"math"
"github.com/EliCDavis/polyform/modeling"
"github.com/EliCDavis/vector/vector3"
"github.com/EliCDavis/vector/vector4"
)
func Read(in io.Reader) (modeling.Mesh, error) {
// 12 + 12 + 4 + 4 = 32
splatBuffer := make([]byte, 32)
positionData := make([]vector3.Float64, 0)
scaleData := make([]vector3.Float64, 0)
colorData := make([]vector3.Float64, 0)
opacityData := make([]float64, 0)
rotationData := make([]vector4.Float64, 0)
var err error
for {
_, err = io.ReadFull(in, splatBuffer)
if err != nil {
break
}
positionData = append(positionData, vector3.New(
math.Float32frombits(binary.LittleEndian.Uint32(splatBuffer)),
math.Float32frombits(binary.LittleEndian.Uint32(splatBuffer[4:])),
math.Float32frombits(binary.LittleEndian.Uint32(splatBuffer[8:])),
).ToFloat64())
scaleData = append(scaleData, vector3.New(
math.Log(float64(math.Float32frombits(binary.LittleEndian.Uint32(splatBuffer[12:])))),
math.Log(float64(math.Float32frombits(binary.LittleEndian.Uint32(splatBuffer[16:])))),
math.Log(float64(math.Float32frombits(binary.LittleEndian.Uint32(splatBuffer[20:])))),
).ToFloat64())
colorData = append(colorData, vector3.New(
((float64(splatBuffer[24])/255.)-0.5)/SH_C0,
((float64(splatBuffer[25])/255.)-0.5)/SH_C0,
((float64(splatBuffer[26])/255.)-0.5)/SH_C0,
).ToFloat64())
a := (float64(splatBuffer[27]) / 255.)
opacityData = append(opacityData, -math.Log((1/a)-1))
rotationData = append(rotationData, vector4.New(
(float64(splatBuffer[28])-128)/128,
(float64(splatBuffer[29])-128)/128,
(float64(splatBuffer[30])-128)/128,
(float64(splatBuffer[31])-128)/128,
).ToFloat64())
}
if err == io.EOF {
err = nil
}
return modeling.NewPointCloud(
map[string][]vector4.Vector[float64]{
modeling.RotationAttribute: rotationData,
},
map[string][]vector3.Vector[float64]{
modeling.PositionAttribute: positionData,
modeling.ScaleAttribute: scaleData,
modeling.FDCAttribute: colorData,
},
nil,
map[string][]float64{
modeling.OpacityAttribute: opacityData,
},
nil,
), err
}