Skip to content

GitLab

OpenGL
OpenGL
Commit cdf19911 authored by Anakin's avatar Anakin
Browse files
Options

calculate polygon normal, tangent, and bitangent, 

next step, use them for calculation
parent 4c40d140
Hide whitespace changes
Inline Side-by-side
Showing with 188 additions and 7 deletions
QtMeshViewer/Header/FileInterface.h
View file @ cdf19911
......@@ -18,6 +18,9 @@ struct VertexData
QVector3D position;
QVector2D texCoord;
QVector3D vertexNormal;
QVector3D polygonNormal;
QVector3D tangent;
QVector3D bitangent;
};
struct Segment {
......
QtMeshViewer/Source/MshFile.cpp
View file @ cdf19911
......@@ -572,18 +572,106 @@ void MshFile::analyseSegmChunks(Model * dataDestination, QList<ChunkHeader*>& ch
if (tmp_buffer.size() == 5)
{
for (size_t i = 0; i < 3; i++)
new_segment->indices.push_back(tmp_buffer.takeFirst());
// calculate poylgon normal, tangent and bitangent
QVector3D vec1, vec2, norm, tan, bi;
QVector2D uv1, uv2;
float f;
vec1 = new_segment->vertices[tmp_buffer[0]].position - new_segment->vertices[tmp_buffer[1]].position;
vec2 = new_segment->vertices[tmp_buffer[0]].position - new_segment->vertices[tmp_buffer[2]].position;
uv1 = new_segment->vertices[tmp_buffer[0]].texCoord - new_segment->vertices[tmp_buffer[1]].texCoord;
uv2 = new_segment->vertices[tmp_buffer[0]].texCoord - new_segment->vertices[tmp_buffer[2]].texCoord;
f = 1.0f / (uv1.x() * uv2.y() - uv2.x() * uv1.y());
norm = QVector3D::crossProduct(vec1, vec2).normalized();
tan.setX(f * (uv2.y() * vec1.x() - uv1.y() * vec2.x()));
tan.setY(f * (uv2.y() * vec1.y() - uv1.y() * vec2.y()));
tan.setZ(f * (uv2.y() * vec1.z() - uv1.y() * vec2.z()));
tan.normalize();
bi.setX(f * (-uv2.x() * vec1.x() + uv1.x() * vec2.x()));
bi.setY(f * (-uv2.x() * vec1.y() + uv1.x() * vec2.y()));
bi.setZ(f * (-uv2.x() * vec1.z() + uv1.x() * vec2.z()));
bi.normalize();
for (int k = 0; k < 3; k++)
{
// polygon normal wasn't calculated before
if (new_segment->vertices[tmp_buffer[k]].polygonNormal == QVector3D(0, 0, 0))
{
new_segment->vertices[tmp_buffer[k]].polygonNormal = norm;
new_segment->vertices[tmp_buffer[k]].tangent = tan;
new_segment->vertices[tmp_buffer[k]].bitangent = bi;
new_segment->indices.push_back(tmp_buffer[k]);
}
// polygon normal already calculated so duplicate the vertex
else
{
new_segment->vertices.push_back(new_segment->vertices[tmp_buffer[k]]);
new_segment->vertices.back().polygonNormal = norm;
new_segment->vertices.back().tangent = tan;
new_segment->vertices.back().bitangent = bi;
new_segment->indices.push_back(new_segment->vertices.size() - 1);
}
}
tmp_buffer.remove(0, 3);
}
else if (tmp_buffer.size() > 5)
{
unsigned int tmp_multiPolySize = tmp_buffer.size() - 2;
// calculate poylgon normal, tangent and bitangent
QVector3D vec1, vec2, norm, tan, bi;
QVector2D uv1, uv2;
float f;
vec1 = new_segment->vertices[tmp_buffer[0]].position - new_segment->vertices[tmp_buffer[1]].position;
vec2 = new_segment->vertices[tmp_buffer[0]].position - new_segment->vertices[tmp_buffer[2]].position;
uv1 = new_segment->vertices[tmp_buffer[0]].texCoord - new_segment->vertices[tmp_buffer[1]].texCoord;
uv2 = new_segment->vertices[tmp_buffer[0]].texCoord - new_segment->vertices[tmp_buffer[2]].texCoord;
f = 1.0f / (uv1.x() * uv2.y() - uv2.x() * uv1.y());
norm = QVector3D::crossProduct(vec1, vec2).normalized();
tan.setX(f * (uv2.y() * vec1.x() - uv1.y() * vec2.x()));
tan.setY(f * (uv2.y() * vec1.y() - uv1.y() * vec2.y()));
tan.setZ(f * (uv2.y() * vec1.z() - uv1.y() * vec2.z()));
tan.normalize();
bi.setX(f * (-uv2.x() * vec1.x() + uv1.x() * vec2.x()));
bi.setY(f * (-uv2.x() * vec1.y() + uv1.x() * vec2.y()));
bi.setZ(f * (-uv2.x() * vec1.z() + uv1.x() * vec2.z()));
bi.normalize();
// for every triangle of the multi polygon..
for (unsigned int tri = 0; tri < tmp_multiPolySize - 2; tri++)
{
// ..calculate the edge indices
for (int triEdge = 0; triEdge < 3; triEdge++)
new_segment->indices.push_back(tmp_buffer[(tri + triEdge - ((tri % 2) * (triEdge - 1) * 2))]);
{
int curIndi = tmp_buffer[(tri + triEdge - ((tri % 2) * (triEdge - 1) * 2))];
// polygon normal wasn't calculated before
if (new_segment->vertices[curIndi].polygonNormal == QVector3D(0, 0, 0))
{
new_segment->vertices[curIndi].polygonNormal = norm;
new_segment->vertices[curIndi].tangent = tan;
new_segment->vertices[curIndi].bitangent = bi;
new_segment->indices.push_back(curIndi);
}
// polygon normal already calculated so duplicate the vertex
else
{
new_segment->vertices.push_back(new_segment->vertices[curIndi]);
new_segment->vertices.back().polygonNormal = norm;
new_segment->vertices.back().tangent = tan;
new_segment->vertices.back().bitangent = bi;
new_segment->indices.push_back(new_segment->vertices.size() - 1);
}
}
}
tmp_buffer.remove(0, tmp_multiPolySize);
}
......@@ -594,17 +682,107 @@ void MshFile::analyseSegmChunks(Model * dataDestination, QList<ChunkHeader*>& ch
// save the last polygon (no 2 high bit followed)
if (tmp_buffer.size() == 3)
{
for (size_t i = 0; i < 3; i++)
new_segment->indices.push_back(tmp_buffer.takeFirst());
// calculate poylgon normal, tangent and bitangent
QVector3D vec1, vec2, norm, tan, bi;
QVector2D uv1, uv2;
float f;
vec1 = new_segment->vertices[tmp_buffer[0]].position - new_segment->vertices[tmp_buffer[1]].position;
vec2 = new_segment->vertices[tmp_buffer[0]].position - new_segment->vertices[tmp_buffer[2]].position;
uv1 = new_segment->vertices[tmp_buffer[0]].texCoord - new_segment->vertices[tmp_buffer[1]].texCoord;
uv2 = new_segment->vertices[tmp_buffer[0]].texCoord - new_segment->vertices[tmp_buffer[2]].texCoord;
f = 1.0f / (uv1.x() * uv2.y() - uv2.x() * uv1.y());
norm = QVector3D::crossProduct(vec1, vec2).normalized();
tan.setX(f * (uv2.y() * vec1.x() - uv1.y() * vec2.x()));
tan.setY(f * (uv2.y() * vec1.y() - uv1.y() * vec2.y()));
tan.setZ(f * (uv2.y() * vec1.z() - uv1.y() * vec2.z()));
tan.normalize();
bi.setX(f * (-uv2.x() * vec1.x() + uv1.x() * vec2.x()));
bi.setY(f * (-uv2.x() * vec1.y() + uv1.x() * vec2.y()));
bi.setZ(f * (-uv2.x() * vec1.z() + uv1.x() * vec2.z()));
bi.normalize();
for (int k = 0; k < 3; k++)
{
//TODO: buffer size == 1; k = 2;
// polygon normal wasn't calculated before
if (new_segment->vertices[tmp_buffer[k]].polygonNormal == QVector3D(0, 0, 0))
{
new_segment->vertices[tmp_buffer[k]].polygonNormal = norm;
new_segment->vertices[tmp_buffer[k]].tangent = tan;
new_segment->vertices[tmp_buffer[k]].bitangent = bi;
new_segment->indices.push_back(tmp_buffer[k]);
}
// polygon normal already calculated so duplicate the vertex
else
{
new_segment->vertices.push_back(new_segment->vertices[tmp_buffer[k]]);
new_segment->vertices.back().polygonNormal = norm;
new_segment->vertices.back().tangent = tan;
new_segment->vertices.back().bitangent = bi;
new_segment->indices.push_back(new_segment->vertices.size() - 1);
}
}
tmp_buffer.remove(0, 3);
}
else if (tmp_buffer.size() > 3)
{
unsigned int tmp_multiPolySize = tmp_buffer.size();
// calculate poylgon normal, tangent and bitangent
QVector3D vec1, vec2, norm, tan, bi;
QVector2D uv1, uv2;
float f;
vec1 = new_segment->vertices[tmp_buffer[0]].position - new_segment->vertices[tmp_buffer[1]].position;
vec2 = new_segment->vertices[tmp_buffer[0]].position - new_segment->vertices[tmp_buffer[2]].position;
uv1 = new_segment->vertices[tmp_buffer[0]].texCoord - new_segment->vertices[tmp_buffer[1]].texCoord;
uv2 = new_segment->vertices[tmp_buffer[0]].texCoord - new_segment->vertices[tmp_buffer[2]].texCoord;
f = 1.0f / (uv1.x() * uv2.y() - uv2.x() * uv1.y());
norm = QVector3D::crossProduct(vec1, vec2).normalized();
tan.setX(f * (uv2.y() * vec1.x() - uv1.y() * vec2.x()));
tan.setY(f * (uv2.y() * vec1.y() - uv1.y() * vec2.y()));
tan.setZ(f * (uv2.y() * vec1.z() - uv1.y() * vec2.z()));
tan.normalize();
bi.setX(f * (-uv2.x() * vec1.x() + uv1.x() * vec2.x()));
bi.setY(f * (-uv2.x() * vec1.y() + uv1.x() * vec2.y()));
bi.setZ(f * (-uv2.x() * vec1.z() + uv1.x() * vec2.z()));
bi.normalize();
// for every triangle of the multi polygon..
for (unsigned int tri = 0; tri < tmp_multiPolySize - 2; tri++)
{
// ..calculate the edge indices
for (int triEdge = 0; triEdge < 3; triEdge++)
new_segment->indices.push_back(tmp_buffer[(tri + triEdge - ((tri % 2) * (triEdge - 1) * 2))]);
{
int curIndi = tmp_buffer[(tri + triEdge - ((tri % 2) * (triEdge - 1) * 2))];
// polygon normal wasn't calculated before
if (new_segment->vertices[curIndi].polygonNormal == QVector3D(0, 0, 0))
{
new_segment->vertices[curIndi].polygonNormal = norm;
new_segment->vertices[curIndi].tangent = tan;
new_segment->vertices[curIndi].bitangent = bi;
new_segment->indices.push_back(curIndi);
}
// polygon normal already calculated so duplicate the vertex
else
{
new_segment->vertices.push_back(new_segment->vertices[curIndi]);
new_segment->vertices.back().polygonNormal = norm;
new_segment->vertices.back().tangent = tan;
new_segment->vertices.back().bitangent = bi;
new_segment->indices.push_back(new_segment->vertices.size() - 1);
}
}
}
}
}
}
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment