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make OBJ reader able to handle files where some vertices have colors and others don't

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This commit is contained in:
Seth Alves 2017-07-22 11:57:51 -07:00
parent 71f0899178
commit 5e04e84953
1 changed files with 17 additions and 4 deletions
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21
libraries/fbx/src/OBJReader.cpp
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@ -118,7 +118,7 @@ glm::vec3 OBJTokenizer::getVec3() {
auto z = getFloat();
auto v = glm::vec3(x, y, z);
while (isNextTokenFloat()) {
// the spec(s) get(s) vague here. might be w, might be a color... chop it off.
// ignore any following floats
nextToken();
}
return v;
@ -130,6 +130,7 @@ bool OBJTokenizer::getVertex(glm::vec3& vertex, glm::vec3& vertexColor) {
auto y = getFloat(); // And order of arguments is different on Windows/Linux.
auto z = getFloat();
vertex = glm::vec3(x, y, z);
vertexColor = glm::vec3(1.0f); // default, in case there is not color information
auto r = 1.0f, g = 1.0f, b = 1.0f;
bool hasVertexColor = false;
@ -139,7 +140,7 @@ bool OBJTokenizer::getVertex(glm::vec3& vertex, glm::vec3& vertexColor) {
// only a single value) that it's a vertex color.
r = getFloat();
if (isNextTokenFloat()) {
// Safe to assume the following values are the green/blue components.
// Safe to assume the following values are the green/blue components.
g = getFloat();
b = getFloat();
@ -351,6 +352,8 @@ bool OBJReader::parseOBJGroup(OBJTokenizer& tokenizer, const QVariantHash& mappi
bool result = true;
int originalFaceCountForDebugging = 0;
QString currentGroup;
bool anyVertexColor { false };
int vertexCount { 0 };
setMeshPartDefaults(meshPart, QString("dontknow") + QString::number(mesh.parts.count()));
@ -416,10 +419,20 @@ bool OBJReader::parseOBJGroup(OBJTokenizer& tokenizer, const QVariantHash& mappi
bool hasVertexColor = tokenizer.getVertex(vertex, vertexColor);
vertices.append(vertex);
if(hasVertexColor) {
// if any vertex has color, they all need to.
if (hasVertexColor && !anyVertexColor) {
// we've had a gap of zero or more vertices without color, followed
// by one that has color. catch up:
for (int i = 0; i < vertexCount; i++) {
vertexColors.append(glm::vec3(1.0f));
}
anyVertexColor = true;
}
if (anyVertexColor) {
vertexColors.append(vertexColor);
}
vertexCount++;
} else if (token == "vn") {
normals.append(tokenizer.getVec3());
} else if (token == "vt") {