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annotate pkg/octree/builder.go @ 968:a4fe07a21ba7

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Moved octree builder into octree package to be reusable by the sounding result import job.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 17 Oct 2018 16:00:49 +0200
parents
children b6fec8f85599
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968
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
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1 package octree
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2
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3 import (
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4 "encoding/binary"
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5 "io"
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6 "log"
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7
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8 "github.com/golang/snappy"
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9 )
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10
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11 type Builder struct {
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12 t *Tin
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13 nodes int
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14 leaves int
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15 index []int32
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16 }
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17
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18 var cubes = [8][2]Vertex{
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19 makeCube(0),
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20 makeCube(1),
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21 makeCube(2),
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22 makeCube(3),
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23 makeCube(4),
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24 makeCube(5),
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25 makeCube(6),
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26 makeCube(7),
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27 }
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29 func makeCube(i int) [2]Vertex {
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30 var d Vertex
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31 if i&1 == 1 {
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32 d.X = 0.5
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33 }
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34 if i&2 == 2 {
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35 d.Y = 0.5
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36 }
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37 if i&4 == 4 {
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38 d.Z = 0.5
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39 }
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40 return [2]Vertex{
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41 Vertex{0.0, 0.0, 0.0}.Add(d),
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42 Vertex{0.5, 0.5, 0.5}.Add(d),
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43 }
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44 }
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45
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46 func NewBuilder(t *Tin) *Builder {
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47 return &Builder{t: t}
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48 }
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49
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50 func (tb *Builder) Build() {
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51
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52 triangles := make([]int32, len(tb.t.Triangles))
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53 for i := range triangles {
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54 triangles[i] = int32(i)
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55 }
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56
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57 tb.index = append(tb.index, 0)
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58
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59 tb.buildRecursive(triangles, tb.t.Min, tb.t.Max, 0)
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60 tb.index[0] = int32(len(tb.index))
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61 log.Printf("num nodes: %d\n", tb.index[0])
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62
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63 log.Printf("nodes: %d leaves: %d index %d\n",
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64 tb.nodes, tb.leaves, tb.index[0])
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65 }
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66
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67 func (tb *Builder) buildRecursive(
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68 triangles []int32,
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69 min, max Vertex,
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70 depth int,
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71 ) int32 {
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72 if len(triangles) <= 16 || depth > 8 {
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73 pos := len(tb.index)
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74 tb.index = append(tb.index, int32(len(triangles)))
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75 tb.index = append(tb.index, triangles...)
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76 //log.Printf("leaf entries: %d (%d)\n", len(triangles), depth)
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77 tb.leaves++
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78 return int32(-(pos + 1))
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79 }
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80
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81 pos := len(tb.index)
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82 tb.index = append(tb.index,
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83 0, 0, 0, 0,
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84 0, 0, 0, 0)
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85
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86 bbox := Interpolate(min, max)
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87
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88 bboxes := make([][2]Vertex, len(cubes))
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89
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90 for i := range cubes {
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91 bboxes[i] = [2]Vertex{
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92 bbox(cubes[i][0]),
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93 bbox(cubes[i][1]),
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94 }
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95 }
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96
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97 var quandrants [8][]int32
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98
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99 for _, tri := range triangles {
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100 triangle := tb.t.Triangles[tri]
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101 v0 := tb.t.Vertices[triangle[0]]
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102 v1 := tb.t.Vertices[triangle[1]]
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103 v2 := tb.t.Vertices[triangle[2]]
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104
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105 l := v0
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106 l.Minimize(v1)
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107 l.Minimize(v2)
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108
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109 h := v0
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110 h.Maximize(v1)
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111 h.Maximize(v2)
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112
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113 for i := range bboxes {
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114 if !(h.Less(bboxes[i][0]) || bboxes[i][1].Less(l)) {
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115 quandrants[i] = append(quandrants[i], tri)
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116 }
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117 }
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118 }
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119
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120 for i := range quandrants {
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121 if len(quandrants[i]) > 0 {
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122 child := tb.buildRecursive(
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123 quandrants[i],
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124 bboxes[i][0], bboxes[i][1],
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125 depth+1)
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126 tb.index[pos+i] = child
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127 }
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128 }
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129 tb.nodes++
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130 return int32(pos)
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131 }
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132
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133 func (tb *Builder) Serialize(w io.Writer) error {
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134 var buf [binary.MaxVarintLen32]byte
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135
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136 if err := binary.Write(w, binary.LittleEndian, tb.index[0]); err != nil {
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137 return err
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138 }
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139
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140 var last int32
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141 var written int
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142
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143 for _, x := range tb.index[1:] {
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144 delta := x - last
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145 n := binary.PutVarint(buf[:], int64(delta))
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146 for p := buf[:n]; len(p) > 0; p = p[n:] {
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147 var err error
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148 if n, err = w.Write(p); err != nil {
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149 return err
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150 }
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151 written += n
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152 }
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153
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154 last = x
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155 }
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156 log.Printf("compressed octree index in bytes: %d (%d)\n",
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157 written, 4*len(tb.index))
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158
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159 return nil
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160 }
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161
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162 func (tb *Builder) WriteTo(w io.Writer) error {
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163 out := snappy.NewBufferedWriter(w)
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164 if err := tb.t.Serialize(out); err != nil {
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165 return err
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166 }
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167 if err := tb.Serialize(out); err != nil {
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168 return err
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169 }
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170 return out.Flush()
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171 }