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Blender >> .obj, .mtl >> Java 使用 min3D, openGL ES >> Android 设备

我做错了什么或者这些 .mtl 或 .obj 文件有什么问题会导致在 min3d 中出现解析器错误？

到目前为止，我只用下划线“mtllib face_mtl”替换了“mtllib face.mtl”中的句点

没有任何东西是表格或间隔的。如果它看起来很奇怪，那是因为我在提交这个问题时犯了错误。

到目前为止，“MatD 教程”中的所有示例都运行良好。只有当我尝试加载自己的文件时，才会遇到问题。

在检查 Wavefront obj 文件的 Wiki 页面时，我逐行查看了这两个文件，但没有运气。

我有一种感觉，这可能与 .mtl 或整个导出中的纹理问题有关。我没有使用 Blender 导出的任何图像或任何其他文件。

非常感谢，我希望这一切都清晰易读。

错误：发生在我在下面的代码中评论的地方

05-11 16:06:01.371：E/AndroidRuntime(2280)：致命异常：GLThread 9

05-11 16:06:01.371: E/AndroidRuntime(2280): java.lang.NullPointerException

05-11 16:06:01.371: E/AndroidRuntime(2280): 在 min3d.parser.ObjParser.readMaterialLib(ObjParser.java:197)

05-11 16:06:01.371: E/AndroidRuntime(2280): 在 min3d.parser.ObjParser.parse(ObjParser.java:107)

05-11 16:06:01.371: E/AndroidRuntime(2280): 在 nbg.min3d.test.Obj3DView.initScene(Obj3DView.java:24)

05-11 16:06:01.371: E/AndroidRuntime(2280): 在 min3d.core.Scene.init(Scene.java:254)

05-11 16:06:01.371: E/AndroidRuntime(2280): 在 min3d.core.Renderer.onSurfaceCreated(Renderer.java:75)

05-11 16:06:01.371: E/AndroidRuntime(2280): 在 android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1317)

05-11 16:06:01.371: E/AndroidRuntime(2280): 在 android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1116)

这是发生错误的地方：

private void readMaterialLib(String libID) {
    StringBuffer resourceID = new StringBuffer(packageID);
    StringBuffer libIDSbuf = new StringBuffer(libID);
    int dotIndex = libIDSbuf.lastIndexOf(".");
    if (dotIndex > -1)
        libIDSbuf = libIDSbuf.replace(dotIndex, dotIndex + 1, "_");

    resourceID.append(":raw/");
    resourceID.append(libIDSbuf.toString());

    InputStream fileIn = resources.openRawResource(resources.getIdentifier(
            resourceID.toString(), null, null));
    BufferedReader buffer = new BufferedReader(
            new InputStreamReader(fileIn));
    String line;
    String currentMaterial = "";

    try {
        while ((line = buffer.readLine()) != null) {
            String[] parts = line.split(" ");
            if (parts.length == 0)
                continue;
            String type = parts[0];

            if (type.equals(NEW_MATERIAL)) {
                if (parts.length > 1) {
                    currentMaterial = parts[1];
                    materialMap.put(currentMaterial, new Material(
                            currentMaterial));
                }
            } else if(type.equals(DIFFUSE_COLOR) && !type.equals(DIFFUSE_TEX_MAP)) {
                Color4 diffuseColor = new Color4(Float.parseFloat(parts[1]) * 255.0f, Float.parseFloat(parts[2]) * 255.0f, Float.parseFloat(parts[3]) * 255.0f, 255.0f);


**//Below is where the error happens.. aka (ObjParser.java: 197)**


                materialMap.get(currentMaterial).diffuseColor = diffuseColor;
            } else if (type.equals(DIFFUSE_TEX_MAP)) {
                if (parts.length > 1) {
                    materialMap.get(currentMaterial).diffuseTextureMap = parts[1];
                    StringBuffer texture = new StringBuffer(packageID);
                    texture.append(":drawable/");

                    StringBuffer textureName = new StringBuffer(parts[1]);
                    dotIndex = textureName.lastIndexOf(".");
                    if (dotIndex > -1)
                        texture.append(textureName.substring(0, dotIndex));
                    else
                        texture.append(textureName);

                    int bmResourceID = resources.getIdentifier(texture
                            .toString(), null, null);
                    Bitmap b = Utils.makeBitmapFromResourceId(bmResourceID);
                    textureAtlas.addBitmapAsset(new BitmapAsset(currentMaterial, texture.toString()));
                }
            }
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}

.obj 文件：

# Blender v2.62 (sub 0) OBJ File: 'cylxyzaxis.blend'
# www.blender.org
mtllib face_mtl
o Cylinder.002
v 0.003384 0.016776 -1.001130
v 0.004515 0.016664 -1.001130
v 0.005603 0.016334 -1.001130
v 0.006606 0.015798 -1.001130
v 0.007485 0.015077 -1.001130
v 0.008206 0.014198 -1.001130
v 0.008742 0.013195 -1.001130
v 0.009072 0.012107 -1.001130
v 0.009184 0.010976 -1.001130
v 0.009072 0.009844 -1.001130
v 0.008742 0.008756 -1.001130
v 0.008206 0.007753 -1.001130
v 0.007485 0.006874 -1.001130
v 0.006606 0.006153 -1.001130
v 0.005603 0.005617 -1.001130
v 0.004515 0.005287 -1.001130
v 0.003384 0.005176 -1.001130
v 0.002252 0.005287 -1.001130
v 0.001164 0.005617 -1.001130
v 0.000161 0.006153 -1.001130
v -0.000717 0.006874 -1.001130
v -0.001439 0.007753 -1.001130
v -0.001975 0.008756 -1.001130
v -0.002305 0.009844 -1.001130
v -0.002416 0.010976 -1.001130
v -0.002305 0.012107 -1.001130
v -0.001975 0.013195 -1.001130
v -0.001439 0.014198 -1.001130
v -0.000717 0.015077 -1.001130
v 0.000161 0.015798 -1.001130
v 0.001164 0.016334 -1.001130
v 0.002252 0.016664 -1.001130
v 0.003384 0.016774 0.998870
v 0.004515 0.016663 0.998870
v 0.005603 0.016333 0.998870
v 0.006606 0.015797 0.998870
v 0.007485 0.015076 0.998870
v 0.008206 0.014197 0.998870
v 0.008742 0.013194 0.998870
v 0.009072 0.012106 0.998870
v 0.009184 0.010974 0.998870
v 0.009072 0.009843 0.998870
v 0.008742 0.008755 0.998870
v 0.008206 0.007752 0.998870
v 0.007485 0.006873 0.998870
v 0.006606 0.006152 0.998870
v 0.005603 0.005616 0.998870
v 0.004515 0.005286 0.998870
v 0.003384 0.005174 0.998870
v 0.002252 0.005286 0.998870
v 0.001164 0.005616 0.998870
v 0.000161 0.006152 0.998870
v -0.000717 0.006873 0.998870
v -0.001439 0.007752 0.998870
v -0.001975 0.008755 0.998870
v -0.002305 0.009843 0.998870
v -0.002416 0.010974 0.998870
v -0.002305 0.012106 0.998870
v -0.001975 0.013194 0.998870
v -0.001439 0.014197 0.998870
v -0.000718 0.015075 0.998870
v 0.000161 0.015797 0.998870
v 0.001164 0.016333 0.998870
v 0.002252 0.016663 0.998870
v 0.003384 0.010976 -1.001130
v 0.003384 0.010974 0.998870
usemtl 
s off
f 65 1 2
f 66 34 33
f 65 2 3
f 66 35 34
f 65 3 4
f 66 36 35
f 65 4 5
f 66 37 36
f 65 5 6
f 66 38 37
f 65 6 7
f 66 39 38
f 65 7 8
f 66 40 39
f 65 8 9
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f 65 9 10
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f 65 30 31
f 66 63 62
f 65 31 32
f 66 64 63
f 32 1 65
f 66 33 64
f 1 33 34 2
f 2 34 35 3
f 3 35 36 4
f 4 36 37 5
f 5 37 38 6
f 6 38 39 7
f 7 39 40 8
f 8 40 41 9
f 9 41 42 10
f 10 42 43 11
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f 12 44 45 13
f 13 45 46 14
f 14 46 47 15
f 15 47 48 16
f 16 48 49 17
f 17 49 50 18
f 18 50 51 19
f 19 51 52 20
f 20 52 53 21
f 21 53 54 22
f 22 54 55 23
f 23 55 56 24
f 24 56 57 25
f 25 57 58 26
f 26 58 59 27
f 27 59 60 28
f 28 60 61 29
f 29 61 62 30
f 30 62 63 31
f 31 63 64 32
f 33 1 32 64
o Cylinder.001
v -0.996616 0.010976 -0.006930
v -0.996616 0.009844 -0.006819
v -0.996616 0.008756 -0.006489
v -0.996616 0.007753 -0.005953
v -0.996616 0.006874 -0.005231
v -0.996616 0.006153 -0.004353
v -0.996616 0.005617 -0.003350
v -0.996616 0.005287 -0.002262
v -0.996616 0.005176 -0.001130
v -0.996616 0.005287 0.000001
v -0.996616 0.005617 0.001089
v -0.996616 0.006153 0.002092
v -0.996616 0.006874 0.002971
v -0.996616 0.007753 0.003692
v -0.996616 0.008756 0.004228
v -0.996616 0.009844 0.004558
v -0.996616 0.010976 0.004670
v -0.996616 0.012107 0.004558
v -0.996616 0.013195 0.004228
v -0.996616 0.014198 0.003692
v -0.996616 0.015077 0.002971
v -0.996616 0.015798 0.002092
v -0.996616 0.016334 0.001089
v -0.996616 0.016664 0.000001
v -0.996616 0.016776 -0.001130
v -0.996616 0.016664 -0.002262
v -0.996616 0.016334 -0.003350
v -0.996616 0.015798 -0.004353
v -0.996616 0.015077 -0.005231
v -0.996616 0.014198 -0.005953
v -0.996616 0.013195 -0.006489
v -0.996616 0.012107 -0.006819
v 1.003384 0.010974 -0.006930
v 1.003384 0.009843 -0.006819
v 1.003384 0.008755 -0.006489
v 1.003384 0.007752 -0.005953
v 1.003384 0.006873 -0.005231
v 1.003384 0.006152 -0.004353
v 1.003384 0.005616 -0.003350
v 1.003384 0.005286 -0.002262
v 1.003384 0.005174 -0.001130
v 1.003384 0.005286 0.000001
v 1.003384 0.005616 0.001089
v 1.003384 0.006152 0.002092
v 1.003384 0.006873 0.002971
v 1.003384 0.007752 0.003692
v 1.003384 0.008755 0.004228
v 1.003384 0.009843 0.004558
v 1.003384 0.010974 0.004670
v 1.003384 0.012106 0.004558
v 1.003384 0.013194 0.004228
v 1.003384 0.014197 0.003692
v 1.003384 0.015076 0.002971
v 1.003384 0.015797 0.002092
v 1.003384 0.016333 0.001089
v 1.003384 0.016663 0.000001
v 1.003384 0.016774 -0.001130
v 1.003384 0.016663 -0.002262
v 1.003384 0.016333 -0.003350
v 1.003384 0.015797 -0.004352
v 1.003384 0.015076 -0.005231
v 1.003384 0.014197 -0.005953
v 1.003384 0.013194 -0.006489
v 1.003384 0.012106 -0.006819
v -0.996616 0.010976 -0.001130
v 1.003384 0.010974 -0.001130
usemtl 
s off
f 131 67 68
f 132 100 99
f 131 68 69
f 132 101 100
f 131 69 70
f 132 102 101
f 131 70 71
f 132 103 102
f 131 71 72
f 132 104 103
f 131 72 73
f 132 105 104
f 131 73 74
f 132 106 105
f 131 74 75
f 132 107 106
f 131 75 76
f 132 108 107
f 131 76 77
f 132 109 108
f 131 77 78
f 132 110 109
f 131 78 79
f 132 111 110
f 131 79 80
f 132 112 111
f 131 80 81
f 132 113 112
f 131 81 82
f 132 114 113
f 131 82 83
f 132 115 114
f 131 83 84
f 132 116 115
f 131 84 85
f 132 117 116
f 131 85 86
f 132 118 117
f 131 86 87
f 132 119 118
f 131 87 88
f 132 120 119
f 131 88 89
f 132 121 120
f 131 89 90
f 132 122 121
f 131 90 91
f 132 123 122
f 131 91 92
f 132 124 123
f 131 92 93
f 132 125 124
f 131 93 94
f 132 126 125
f 131 94 95
f 132 127 126
f 131 95 96
f 132 128 127
f 131 96 97
f 132 129 128
f 131 97 98
f 132 130 129
f 98 67 131
f 132 99 130
f 67 99 100 68
f 68 100 101 69
f 69 101 102 70
f 70 102 103 71
f 71 103 104 72
f 72 104 105 73
f 73 105 106 74
f 74 106 107 75
f 75 107 108 76
f 76 108 109 77
f 77 109 110 78
f 78 110 111 79
f 79 111 112 80
f 80 112 113 81
f 81 113 114 82
f 82 114 115 83
f 83 115 116 84
f 84 116 117 85
f 85 117 118 86
f 86 118 119 87
f 87 119 120 88
f 88 120 121 89
f 89 121 122 90
f 90 122 123 91
f 91 123 124 92
f 92 124 125 93
f 93 125 126 94
f 94 126 127 95
f 95 127 128 96
f 96 128 129 97
f 97 129 130 98
f 99 67 98 130
o Cylinder
v 0.000000 -1.000000 -0.005800
v 0.001132 -1.000000 -0.005689
v 0.002220 -1.000000 -0.005358
v 0.003222 -1.000000 -0.004822
v 0.004101 -1.000000 -0.004101
v 0.004822 -1.000000 -0.003222
v 0.005358 -1.000000 -0.002220
v 0.005689 -1.000000 -0.001132
v 0.005800 -1.000000 -0.000000
v 0.005689 -1.000000 0.001132
v 0.005358 -1.000000 0.002220
v 0.004822 -1.000000 0.003222
v 0.004101 -1.000000 0.004101
v 0.003222 -1.000000 0.004822
v 0.002220 -1.000000 0.005358
v 0.001132 -1.000000 0.005689
v -0.000000 -1.000000 0.005800
v -0.001132 -1.000000 0.005689
v -0.002220 -1.000000 0.005358
v -0.003222 -1.000000 0.004822
v -0.004101 -1.000000 0.004101
v -0.004822 -1.000000 0.003222
v -0.005358 -1.000000 0.002220
v -0.005689 -1.000000 0.001132
v -0.005800 -1.000000 -0.000000
v -0.005689 -1.000000 -0.001132
v -0.005358 -1.000000 -0.002220
v -0.004822 -1.000000 -0.003222
v -0.004101 -1.000000 -0.004101
v -0.003222 -1.000000 -0.004822
v -0.002220 -1.000000 -0.005358
v -0.001132 -1.000000 -0.005689
v 0.000000 1.000000 -0.005800
v 0.001132 1.000000 -0.005689
v 0.002220 1.000000 -0.005358
v 0.003222 1.000000 -0.004822
v 0.004101 1.000000 -0.004101
v 0.004822 1.000000 -0.003222
v 0.005358 1.000000 -0.002220
v 0.005689 1.000000 -0.001132
v 0.005800 1.000000 0.000000
v 0.005689 1.000000 0.001132
v 0.005358 1.000000 0.002220
v 0.004822 1.000000 0.003222
v 0.004101 1.000000 0.004101
v 0.003222 1.000000 0.004822
v 0.002220 1.000000 0.005358
v 0.001132 1.000000 0.005689
v 0.000000 1.000000 0.005800
v -0.001132 1.000000 0.005689
v -0.002220 1.000000 0.005358
v -0.003222 1.000000 0.004822
v -0.004101 1.000000 0.004101
v -0.004822 1.000000 0.003222
v -0.005358 1.000000 0.002220
v -0.005688 1.000000 0.001132
v -0.005800 1.000000 0.000000
v -0.005689 1.000000 -0.001131
v -0.005358 1.000000 -0.002220
v -0.004822 1.000000 -0.003222
v -0.004101 1.000000 -0.004101
v -0.003222 1.000000 -0.004822
v -0.002220 1.000000 -0.005358
v -0.001132 1.000000 -0.005688
v 0.000000 -1.000000 0.000000
v 0.000000 1.000000 0.000000
usemtl 
s off
f 197 133 134
f 198 166 165
f 197 134 135
f 198 167 166
f 197 135 136
f 198 168 167
f 197 136 137
f 198 169 168
f 197 137 138
f 198 170 169
f 197 138 139
f 198 171 170
f 197 139 140
f 198 172 171
f 197 140 141
f 198 173 172
f 197 141 142
f 198 174 173
f 197 142 143
f 198 175 174
f 197 143 144
f 198 176 175
f 197 144 145
f 198 177 176
f 197 145 146
f 198 178 177
f 197 146 147
f 198 179 178
f 197 147 148
f 198 180 179
f 197 148 149
f 198 181 180
f 197 149 150
f 198 182 181
f 197 150 151
f 198 183 182
f 197 151 152
f 198 184 183
f 197 152 153
f 198 185 184
f 197 153 154
f 198 186 185
f 197 154 155
f 198 187 186
f 197 155 156
f 198 188 187
f 197 156 157
f 198 189 188
f 197 157 158
f 198 190 189
f 197 158 159
f 198 191 190
f 197 159 160
f 198 192 191
f 197 160 161
f 198 193 192
f 197 161 162
f 198 194 193
f 197 162 163
f 198 195 194
f 197 163 164
f 198 196 195
f 164 133 197
f 198 165 196
f 133 165 166 134
f 134 166 167 135
f 135 167 168 136
f 136 168 169 137
f 137 169 170 138
f 138 170 171 139
f 139 171 172 140
f 140 172 173 141
f 141 173 174 142
f 142 174 175 143
f 143 175 176 144
f 144 176 177 145
f 145 177 178 146
f 146 178 179 147
f 147 179 180 148
f 148 180 181 149
f 149 181 182 150
f 150 182 183 151
f 151 183 184 152
f 152 184 185 153
f 153 185 186 154
f 154 186 187 155
f 155 187 188 156
f 156 188 189 157
f 157 189 190 158
f 158 190 191 159
f 159 191 192 160
f 160 192 193 161
f 161 193 194 162
f 162 194 195 163
f 163 195 196 164
f 165 133 164 196

.mtl 文件：

# Blender MTL File: 'cylxyzaxis.blend'
# Material Count: 1
newmtl
Ns 1.00000
Ka 0.000000 0.000000 0.000000
Kd 0.8 0.8 0.8
Ks 0.8 0.8 0.8
d 1
illum 2
4

1 回答 1

2

我不是 .obj 的专家，但我认为这usemtl可能应该指定一个材料名称？类似的东西usemtl some_material。

这似乎与您的“当前材料为空”错误一致。

也应该在 mtl 文件中为材料命名：

newmtl some_material

于 2012-05-11T21:15:07.030 回答