zcy
/
dust3d
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Calculate part preview in the same normal method with final model

master
Jeremy Hu 2018-10-19 13:08:02 +08:00
parent 2f32158940
commit 02963ebf8b
1 changed files with 37 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
src/meshloader.cpp
View File

@ -1,6 +1,7 @@
#include <assert.h>
#include <QTextStream>
#include <QFile>
#include <cmath>
#include "meshloader.h"
#include "meshlite.h"
#include "theme.h"
@ -103,6 +104,16 @@ MeshLoader::MeshLoader(void *meshlite, int meshId, int triangulatedMeshId, QColo
GLfloat *triangleNormals = new GLfloat[triangleCount * 3];
int loadedTriangleNormalItemCount = meshlite_get_triangle_normal_array(meshlite, triangleMesh, triangleNormals, triangleCount * 3);
auto angleBetweenVectors = [](const QVector3D &first, const QVector3D &second) {
return std::acos(QVector3D::dotProduct(first.normalized(), second.normalized()));
};
auto areaOfTriangle = [](const QVector3D &a, const QVector3D &b, const QVector3D &c) {
auto ab = b - a;
auto ac = c - a;
return 0.5 * QVector3D::crossProduct(ab, ac).length();
};
float modelR = defaultColor.redF();
float modelG = defaultColor.greenF();
float modelB = defaultColor.blueF();
@ -125,6 +136,26 @@ MeshLoader::MeshLoader(void *meshlite, int meshId, int triangulatedMeshId, QColo
triangulatedFace.color.setRedF(useColorR);
triangulatedFace.color.setGreenF(useColorG);
triangulatedFace.color.setBlueF(useColorB);
QVector3D positions[3];
float area = 1.0;
float angles[3] = {1.0, 1.0, 1.0};
if (smoothNormal) {
for (int j = 0; j < 3; j++) {
assert(firstIndex + j < loadedTriangleVertexIndexItemCount);
int posIndex = triangleIndices[firstIndex + j] * 3;
assert(posIndex < loadedTriangleVertexPositionItemCount);
positions[j] = QVector3D(triangleVertexPositions[posIndex + 0],
triangleVertexPositions[posIndex + 1],
triangleVertexPositions[posIndex + 2]);
}
const auto &v1 = positions[0];
const auto &v2 = positions[1];
const auto &v3 = positions[2];
area = areaOfTriangle(v1, v2, v3);
angles[0] = angleBetweenVectors(v2-v1, v3-v1);
angles[1] = angleBetweenVectors(v1-v2, v3-v2);
angles[2] = angleBetweenVectors(v1-v3, v2-v3);
}
for (int j = 0; j < 3; j++) {
assert(firstIndex + j < loadedTriangleVertexIndexItemCount);
int posIndex = triangleIndices[firstIndex + j] * 3;
@ -139,9 +170,10 @@ MeshLoader::MeshLoader(void *meshlite, int meshId, int triangulatedMeshId, QColo
v->normY = triangleNormals[firstIndex + 1];
v->normZ = triangleNormals[firstIndex + 2];
if (smoothNormal) {
triangleVertexSmoothNormals[posIndex + 0] += v->normX;
triangleVertexSmoothNormals[posIndex + 1] += v->normY;
triangleVertexSmoothNormals[posIndex + 2] += v->normZ;
auto factor = area * angles[j];
triangleVertexSmoothNormals[posIndex + 0] += v->normX * factor;
triangleVertexSmoothNormals[posIndex + 1] += v->normY * factor;
triangleVertexSmoothNormals[posIndex + 2] += v->normZ * factor;
}
v->colorR = useColorR;
v->colorG = useColorG;
@ -149,6 +181,8 @@ MeshLoader::MeshLoader(void *meshlite, int meshId, int triangulatedMeshId, QColo
v->metalness = useMetalness;
v->roughness = useRoughness;
}
m_triangulatedFaces.push_back(triangulatedFace);
}