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Thomas Forgione 2021-01-21 08:35:09 +01:00
parent d9a198079b
commit b03e8f55db
5 changed files with 1044 additions and 4 deletions
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17
README.md
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@ -120,6 +120,23 @@ df 1
**Attention :** les indices des faces suivantes ne sont pas changés après la
suppression d'une ancienne face.
##### Changer la couleur d'une face
Notre format OBJ permet de changer la couleur d'une face. Pour changer la
couleur d'une face, il suffit de d'utiliser les caractères `fc` suivis de
l'indice de la face dont vous souhaitez changer la couleur, puis des
composantes rouges, vertes et bleues, entre 0 et 1.
```
v 0.0 0.0 0.0
v 1.0 0.0 0.0
v 1.0 1.0 0.0
v 1.0 1.0 1.0
f 1 2 3
fc 1 1.0 0.0 0.0
```
###### Triangle strips et triangle fans
Pour la compression de contenu 3D, on peut utiliser des [Triangle
Strips](https://en.wikipedia.org/wiki/Triangle_strip) et des [Triangle

948
assets/bunny.obj
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@ -2306,6 +2306,954 @@ ev 450 -0.6418495800224314 -0.6291525432873428 0.09222052902359912
ev 451 0.14466910367553898 -0.9808897695253331 0.7832160133094732
ev 452 -0.17565564284755963 -0.984634122983667 0.7465170981993066
ev 453 -0.007794154483274585 -0.9838976615325683 0.7916270551392464
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fc 800 1.0 0.0 0.0
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fc 900 1.0 0.0 0.0
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fc 911 1.0 0.0 0.0
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fc 920 1.0 0.0 0.0
fc 921 1.0 0.0 0.0
fc 922 1.0 0.0 0.0
fc 923 1.0 0.0 0.0
fc 924 1.0 0.0 0.0
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fc 927 1.0 0.0 0.0
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fc 931 1.0 0.0 0.0
fc 932 1.0 0.0 0.0
fc 933 1.0 0.0 0.0
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fc 935 1.0 0.0 0.0
fc 936 1.0 0.0 0.0
fc 937 1.0 0.0 0.0
fc 938 1.0 0.0 0.0
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fc 940 1.0 0.0 0.0
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fc 943 1.0 0.0 0.0
fc 944 1.0 0.0 0.0
fc 945 1.0 0.0 0.0
fc 946 1.0 0.0 0.0
fc 947 1.0 0.0 0.0
fc 948 1.0 0.0 0.0
df 1
df 2
df 3

55
js/obja.js
View File

@ -54,6 +54,16 @@ function parseLine(line, number) {
);
return element;
case "fc":
element.type = Element.SetFaceColor;
element.id = parseInt(split[1], 10) - 1;
element.value = new THREE.Color(
parseFloat(split[2]),
parseFloat(split[3]),
parseFloat(split[4]),
);
return element;
case "ts":
element.type = Element.AddTriangleStrip;
element.value = [];
@ -98,6 +108,15 @@ function parseLine(line, number) {
);
return element;
case "pv":
element.type = Element.PredictVertex;
element.value = new THREE.Face3(
parseInt(split[2], 10) - 1,
parseInt(split[2], 10) - 1,
parseInt(split[2], 10) - 1,
);
return element;
case "efv":
element.type = Element.EditFaceVertex;
element.id = parseInt(split[1], 10) - 1;
@ -140,6 +159,8 @@ Element.EditFace = "EditFace";
Element.EditFaceVertex = "EditFaceVertex";
Element.TranslateVertex = "TranslateVertex";
Element.DeleteFace = "DeleteFace";
Element.SetFaceColor = "SetFaceColor";
Element.PredictVertex = "PredictVertex";
class Loader {
constructor(path, chunkSize = 1024, timeout = 20) {
@ -204,6 +225,7 @@ class Model extends THREE.Mesh {
new THREE.MeshLambertMaterial( { color: 0xffffff, side: THREE.DoubleSide } ),
new THREE.MeshBasicMaterial( { transparent: true, opacity: 0 } )
];
materials[0].vertexColors = true;
super(geometry, materials);
this.frustumCulled = false;
this.path = path;
@ -246,6 +268,25 @@ class Model extends THREE.Mesh {
}
checkVertexPrediction(f) {
let vertices = this.geometry.vertices;
if (vertices[f.a] === undefined) {
this.throwError("Vertex prediction requires vertex " + (f.a + 1) + " but there is no such vertex");
}
if (vertices[f.b] === undefined) {
this.throwError("Vertex prediction requires vertex " + (f.b + 1) + " but there is no such vertex");
}
if (vertices[f.c] === undefined) {
this.throwError("Vertex prediction requires vertex " + (f.c + 1) + " but there is no such vertex");
}
}
manageElement(element) {
let vertices = this.geometry.vertices;
@ -341,6 +382,20 @@ class Model extends THREE.Mesh {
this.geometry.elementsNeedUpdate = true;
break;
case Element.SetFaceColor:
this.geometry.faces[element.id].color.r = element.value.r;
this.geometry.faces[element.id].color.g = element.value.g;
this.geometry.faces[element.id].color.b = element.value.b;
this.geometry.colorsNeedUpdate = true;
break;
case Element.PredictVertex:
this.checkVertexPrediction(element.value);
vertices.push(vertices[element.value.a].clone()
.add(vertices[element.value.c])
.sub(vertices[element.value.b]));
this.geometry.verticesNeedUpdate = true;
break;
default:
throw new Error("unknown element type: " + element.type);

20
src/Loader.js
View File

@ -27,7 +27,7 @@ function fetchData(path, start, end, callback) {
xhr.send();
}
function parseLine(line) {
function parseLine(line, number) {
let element = {};
let split = line.split(/[ \t]+/);
@ -54,6 +54,16 @@ function parseLine(line) {
);
return element;
case "fc":
element.type = Element.SetFaceColor;
element.id = parseInt(split[1], 10) - 1;
element.value = new THREE.Color(
parseFloat(split[2]),
parseFloat(split[3]),
parseFloat(split[4]),
);
return element;
case "ts":
element.type = Element.AddTriangleStrip;
element.value = [];
@ -134,7 +144,8 @@ function parseLine(line) {
return;
default:
throw new Error(split[0] + " is not a defined macro");
return;
// throw new Error(split[0] + " is not a defined macro in line " + number);
}
}
@ -149,6 +160,7 @@ Element.EditFace = "EditFace";
Element.EditFaceVertex = "EditFaceVertex";
Element.TranslateVertex = "TranslateVertex";
Element.DeleteFace = "DeleteFace";
Element.SetFaceColor = "SetFaceColor";
Element.PredictVertex = "PredictVertex";
class Loader {
@ -197,8 +209,8 @@ class Loader {
split[0] = this.remainder + split[0];
this.remainder = split.pop();
for (let line of split) {
elements.push(parseLine(line));
for (let i = 0; i < split.length; i++) {
elements.push(parseLine(split[i], i));
}
callback(elements);

8
src/Model.js
View File

@ -5,6 +5,7 @@ class Model extends THREE.Mesh {
new THREE.MeshLambertMaterial( { color: 0xffffff, side: THREE.DoubleSide } ),
new THREE.MeshBasicMaterial( { transparent: true, opacity: 0 } )
];
materials[0].vertexColors = true;
super(geometry, materials);
this.frustumCulled = false;
this.path = path;
@ -161,6 +162,13 @@ class Model extends THREE.Mesh {
this.geometry.elementsNeedUpdate = true;
break;
case Element.SetFaceColor:
this.geometry.faces[element.id].color.r = element.value.r;
this.geometry.faces[element.id].color.g = element.value.g;
this.geometry.faces[element.id].color.b = element.value.b;
this.geometry.colorsNeedUpdate = true;
break;
case Element.PredictVertex:
this.checkVertexPrediction(element.value);
vertices.push(vertices[element.value.a].clone()