-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathparser.go
393 lines (368 loc) · 10.9 KB
/
parser.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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
package yagrt
import (
"fmt"
"os"
"strconv"
"strings"
"github.com/beevik/etree"
)
// ParseScene parses the given xml scene and fill in a Scene struct
// TODO: Fix this crappy code
func ParseScene(filename string) *Scene {
var scene Scene
doc := etree.NewDocument()
if _, err := os.Stat(filename); os.IsNotExist(err) {
fmt.Println("Cannot find XML:", filename)
}
if err := doc.ReadFromFile(filename); err != nil {
panic(err)
}
root := doc.SelectElement("Scene")
// Background Color
elem := root.SelectElement("BackgroundColor")
if elem != nil {
col, err := colorFromString(strings.TrimSpace(elem.Text()))
if err != nil {
fmt.Println("Cannot set BackgroundColor")
}
scene.BackgroundColor = col
}
// Shadow Epsilon
elem = root.SelectElement("ShadowRayEpsilon")
if elem != nil {
eps, err := ParseFloat(strings.TrimSpace(elem.Text()))
if err != nil {
fmt.Println("Cannot set BackgroundColor")
}
ShadowEpsilon = eps
}
// IntersectionTestEpsilon
elem = root.SelectElement("IntersectionTestEpsilon")
if elem != nil {
eps, err := ParseFloat(strings.TrimSpace(elem.Text()))
if err != nil {
fmt.Println("Cannot set BackgroundColor")
}
HitEpsilon = eps
}
// Cameras
elem = root.SelectElement("Cameras")
cameras := elem.SelectElements("Camera")
for _, cam := range cameras {
camera := parseCamera(cam)
scene.Cameras = append(scene.Cameras, camera)
}
elem = root.SelectElement("Lights")
// Ambient Light
amblight := elem.SelectElement("AmbientLight")
amb, err := colorFromString(amblight.Text())
if err != nil {
fmt.Println("Cannot parse Ambient Light")
}
scene.AmbientLight = amb
// Lights
lights := elem.SelectElements("PointLight")
for _, l := range lights {
light := parseLight(l)
scene.PointLights = append(scene.PointLights, light)
}
// Materials
elem = root.SelectElement("Materials")
materials := elem.SelectElements("Material")
for _, mat := range materials {
material := parseMaterial(mat)
scene.Materials = append(scene.Materials, material)
}
// VertexData
elem = root.SelectElement("VertexData")
vertices := strings.Split(strings.TrimSpace(elem.Text()), "\n")
for i, vert := range vertices {
vert = strings.TrimSpace(vert)
if len(vert) == 0 {
continue
}
vec, err := vectorFromString(vert)
if err != nil {
fmt.Printf("Cannot parse %v Vertex %v", i, err)
continue
}
scene.VertexData = append(scene.VertexData, vec)
}
// Objects
elem = root.SelectElement("Objects")
spheres := elem.SelectElements("Sphere")
for _, sph := range spheres {
sphere := parseSphere(sph, scene.VertexData, scene.Materials)
scene.Shapes = append(scene.Shapes, sphere)
}
triangles := elem.SelectElements("Triangle")
for _, trg := range triangles {
triangle := parseTriangle(trg, scene.VertexData, scene.Materials)
scene.Shapes = append(scene.Shapes, triangle)
}
meshes := elem.SelectElements("Mesh")
for _, msh := range meshes {
mesh := parseMesh(msh, scene.VertexData, scene.Materials)
scene.Shapes = append(scene.Shapes, mesh)
}
return &scene
}
func parseMesh(msh *etree.Element, vertexData []Vector, materials []Material) *Mesh {
var mesh Mesh
elem := msh.SelectElement("Material")
mat, err := strconv.ParseInt(strings.TrimSpace(elem.Text()), 10, 64)
if err != nil {
fmt.Println("Cannot parse mesh material")
}
mesh.Mat = materials[int(mat)-1]
faces := strings.Split(strings.TrimSpace(msh.SelectElement("Faces").Text()), "\n")
for i, face := range faces {
triangle := Triangle{}
indices := strings.Fields(strings.TrimSpace(face))
v1, err1 := strconv.ParseInt(indices[0], 10, 64)
v2, err2 := strconv.ParseInt(indices[1], 10, 64)
v3, err3 := strconv.ParseInt(indices[2], 10, 64)
if err1 != nil || err2 != nil || err3 != nil {
fmt.Printf("Cannot parse indices of face with id %v\n", i)
}
triangle.Mat = mesh.Mat
triangle.V0 = vertexData[int(v1)-1]
triangle.V1 = vertexData[int(v2)-1]
triangle.V2 = vertexData[int(v3)-1]
mesh.Triangles = append(mesh.Triangles, triangle)
}
return &mesh
}
func parseTriangle(trg *etree.Element, vertexData []Vector, materials []Material) *Triangle {
var triangle Triangle
elem := trg.SelectElement("Material")
mat, err := strconv.ParseInt(strings.TrimSpace(elem.Text()), 10, 64)
if err != nil {
fmt.Println("Cannot parse triangle material")
}
elem = trg.SelectElement("Indices")
indices := strings.Fields(strings.TrimSpace(elem.Text()))
v1, err1 := strconv.ParseInt(indices[0], 10, 64)
v2, err2 := strconv.ParseInt(indices[1], 10, 64)
v3, err3 := strconv.ParseInt(indices[2], 10, 64)
if err1 != nil || err2 != nil || err3 != nil {
fmt.Printf("Cannot parse indices of triangle with id %v\n", trg.SelectAttr("id"))
}
triangle.Mat = materials[int(mat)-1]
triangle.V0 = vertexData[int(v1)-1]
triangle.V1 = vertexData[int(v2)-1]
triangle.V2 = vertexData[int(v3)-1]
return &triangle
}
func parseSphere(sph *etree.Element, vertexData []Vector, materials []Material) *Sphere {
var sphere Sphere
elem := sph.SelectElement("Material")
mat, err := strconv.ParseInt(strings.TrimSpace(elem.Text()), 10, 64)
if err != nil {
fmt.Println("Cannot parse sphere material")
}
elem = sph.SelectElement("Radius")
rad, err := ParseFloat(strings.TrimSpace(elem.Text()))
if err != nil {
fmt.Println("Cannot parse sphere Radius")
}
elem = sph.SelectElement("Center")
cen, err := strconv.ParseInt(strings.TrimSpace(elem.Text()), 10, 64)
if err != nil {
fmt.Println("Cannot parse sphere Center")
}
sphere.Mat = materials[int(mat)-1]
sphere.Radius = rad
sphere.Origin = vertexData[cen-1]
return &sphere
}
func parseMaterial(mat *etree.Element) Material {
var material Material
var ar, dr, sr Color
var ph float64
var err error
elem := mat.SelectElement("AmbientReflectance")
if elem != nil {
ar, err = colorFromString(strings.TrimSpace(elem.Text()))
if err != nil {
fmt.Println("Cannot parse AmbientReflectance of Material")
}
} else {
fmt.Println("No AmbientReflectance using (0, 0, 0)")
}
elem = mat.SelectElement("DiffuseReflectance")
if elem != nil {
dr, err = colorFromString(strings.TrimSpace(elem.Text()))
if err != nil {
fmt.Println("Cannot parse DiffuseReflectance of Material")
}
} else {
fmt.Println("No DiffuseReflectance using (0, 0, 0)")
}
elem = mat.SelectElement("SpecularReflectance")
if elem != nil {
sr, err = colorFromString(strings.TrimSpace(elem.Text()))
if err != nil {
fmt.Println("Cannot parse SpecularReflectance of Material")
}
} else {
fmt.Println("No SpecularReflectance using (0, 0, 0)")
}
elem = mat.SelectElement("PhongExponent")
if elem != nil {
ph, err = ParseFloat(strings.TrimSpace(elem.Text()))
if err != nil {
fmt.Println("Cannot parse PhongExponent of Material")
}
}
material.AmbientReflectance = ar
material.DiffuseReflectance = dr
material.SpecularReflectance = sr
material.PhongExponent = ph
return material
}
func parseLight(light *etree.Element) PointLight {
var pointLight PointLight
elem := light.SelectElement("Position")
pos, err := vectorFromString(strings.TrimSpace(elem.Text()))
if err != nil {
fmt.Println("Cannot parse Light position")
}
elem = light.SelectElement("Intensity")
ints, err := colorFromString(strings.TrimSpace(elem.Text()))
if err != nil {
fmt.Println("Cannot parse Light Intensity")
}
pointLight.Position = pos
pointLight.Intensity = ints
return pointLight
}
func parseCamera(cam *etree.Element) Camera {
var camera Camera
var pos, gaze, up Vector
//fmt.Printf("%v (id=%v)\n", cam.Tag, cam.SelectAttr("id").Value)
// Position
camElem := cam.SelectElement("Position")
if camElem != nil {
vec, err := vectorFromString(strings.TrimSpace(camElem.Text()))
if err != nil {
fmt.Println("Cannot get camera position")
}
pos = vec
}
// Gaze
camElem = cam.SelectElement("Gaze")
if camElem != nil {
vec, err := vectorFromString(strings.TrimSpace(camElem.Text()))
if err != nil {
fmt.Println("Cannot get camera position")
}
gaze = vec
}
// Up
camElem = cam.SelectElement("Up")
if camElem != nil {
vec, err := vectorFromString(strings.TrimSpace(camElem.Text()))
if err != nil {
fmt.Println("Cannot get camera position")
}
up = vec
}
// NearPlane
camElem = cam.SelectElement("NearPlane")
if camElem != nil {
nums := strings.Fields(strings.TrimSpace(camElem.Text()))
if len(nums) != 4 {
fmt.Println("NearPlane should consists of l, r, b, t elements")
}
var l, r, b, t float64
var err error
if l, err = ParseFloat(nums[0]); err != nil {
fmt.Println("Nearplane Left value parse error")
}
if r, err = ParseFloat(nums[1]); err != nil {
fmt.Println("Nearplane Right value parse error")
}
if b, err = ParseFloat(nums[2]); err != nil {
fmt.Println("Nearplane Bottom value parse error")
}
if t, err = ParseFloat(nums[3]); err != nil {
fmt.Println("Nearplane Top value parse error")
}
camera.NearPlane.Left = l
camera.NearPlane.Right = r
camera.NearPlane.Bottom = b
camera.NearPlane.Top = t
}
// NearDistance
camElem = cam.SelectElement("NearDistance")
if camElem != nil {
d, err := ParseFloat(strings.TrimSpace(camElem.Text()))
if err != nil {
fmt.Println("Cannot parse NearDistance")
}
camera.Distance = d
}
// ImageResolution
camElem = cam.SelectElement("ImageResolution")
if camElem != nil {
nums := strings.Fields(strings.TrimSpace(camElem.Text()))
if len(nums) != 2 {
fmt.Println("Resolution must be 2D")
}
width, err := strconv.ParseInt(nums[0], 10, 64)
if err != nil {
fmt.Println("Cannot parse Width of Resolution")
}
height, err := strconv.ParseInt(nums[1], 10, 64)
if err != nil {
fmt.Println("Cannot parse Height of Resolution")
}
camera.Resolution.Width = int(width)
camera.Resolution.Height = int(height)
}
// ImageName
camElem = cam.SelectElement("ImageName")
if camElem != nil {
camera.ImageName = strings.TrimSpace(camElem.Text())
}
// INITIALIZE CAMERA DIRECTION
camera.LookAt(pos, gaze, up)
return camera
}
func vectorFromString(s string) (Vector, error) {
nums := strings.Fields(s)
if len(nums) != 3 {
return Vector{}, fmt.Errorf("Cannot convert to vector without 3 elements")
}
var x, y, z float64
var err error
if x, err = ParseFloat(nums[0]); err != nil {
return Vector{}, fmt.Errorf("Cannot parse X value of Vector")
}
if y, err = ParseFloat(nums[1]); err != nil {
return Vector{}, fmt.Errorf("Cannot parse Y value of Vector")
}
if z, err = ParseFloat(nums[2]); err != nil {
return Vector{}, fmt.Errorf("Cannot parse Z value of Vector")
}
return Vector{x, y, z}, nil
}
func colorFromString(s string) (Color, error) {
nums := strings.Fields(s)
if len(nums) != 3 {
return Color{}, fmt.Errorf("Cannot convert to vector without 3 elements")
}
var r, g, b float64
var err error
if r, err = ParseFloat(nums[0]); err != nil {
return Color{}, fmt.Errorf("Cannot parse X value of Vector")
}
if g, err = ParseFloat(nums[1]); err != nil {
return Color{}, fmt.Errorf("Cannot parse Y value of Vector")
}
if b, err = ParseFloat(nums[2]); err != nil {
return Color{}, fmt.Errorf("Cannot parse Z value of Vector")
}
return Color{r, g, b}, nil
}