DatasmithExportHelper.cpp

// Copyright 1998-2019 Epic Games, Inc. All Rights Reserved.
 
#include "DatasmithExportHelper.h"
 
#include "DatasmithMesh.h"
#include "DatasmithMeshExporter.h"
 
void FDatasmithExportHelper::CreateSimpleBox( FDatasmithMesh& Mesh )
{
    int32 NumFaces = 6; //six quads on a box
    int32 NumTriangles = 12; //everything should be converted to triangles
    int32 NumVertex = 8; //eight shared vertex to create all the triangles
 
    //set the num of needed geometry vertex and faces
    Mesh.SetVerticesCount(NumVertex);
    Mesh.SetFacesCount(NumTriangles);
 
    // Set the position of each vertex
    Mesh.SetVertex(0, -50.0, -50.0, 0.0);
    Mesh.SetVertex(1, -50.0, 50.0, 0.0);
    Mesh.SetVertex(2, 50.0, 50.0, 0.0);
    Mesh.SetVertex(3, 50.0, -50.0, 0.0);
    Mesh.SetVertex(4, -50.0, -50.0, -100.0);
    Mesh.SetVertex(5, -50.0, 50.0, -100.0);
    Mesh.SetVertex(6, 50.0, 50.0, -100.0);
    Mesh.SetVertex(7, 50.0, -50.0, -100.0);
 
 
    // Set the num of needed UV vertex
    Mesh.SetUVCount(0, 4);
 
    //set the actual position of each uv vertex
    Mesh.SetUV(0, 0, 0.0, 0.0);
    Mesh.SetUV(0, 1, 0.0, 1.0);
    Mesh.SetUV(0, 2, 1.0, 1.0);
    Mesh.SetUV(0, 3, 1.0, 0.0);
 
 
    // Create polygons. Assign texture and texture UV indices.
 
    //We'll create three quads with material 0 and three quads with material 1
 
    //SetFace: face index, vert1, vert2, vert3, FaceId
    int32 FaceId = 0;
    Mesh.SetFace(0, 1, 2, 0, FaceId); //top face
    Mesh.SetFace(1, 3, 0, 2, FaceId);
    Mesh.SetFace(2, 6, 5, 4, FaceId); //bottom face
    Mesh.SetFace(3, 4, 7, 6, FaceId);
    Mesh.SetFace(4, 4, 5, 1, FaceId); //left face
    Mesh.SetFace(5, 1, 0, 4, FaceId);
    
    FaceId = 1;
    Mesh.SetFace(6, 6, 7, 2, FaceId); //right face
    Mesh.SetFace(7, 3, 2, 7, FaceId);
    Mesh.SetFace(8, 7, 4, 0, FaceId); //front face
    Mesh.SetFace(9, 0, 3, 7, FaceId);
    Mesh.SetFace(10, 5, 6, 1, FaceId); //back face
    Mesh.SetFace(11, 2, 1, 6, FaceId);
 
 
    //set uv indexes for each face vertex
    //top faces
    Mesh.SetFaceUV(0, 0, 1, 2, 0);
    Mesh.SetFaceUV(1, 0, 3, 0, 2);
    //bottom faces
    Mesh.SetFaceUV(2, 0, 2, 1, 0);
    Mesh.SetFaceUV(3, 0, 0, 3, 2);
    //left faces
    Mesh.SetFaceUV(4, 0, 2, 1, 0);
    Mesh.SetFaceUV(5, 0, 0, 3, 2);
    //right faces
    Mesh.SetFaceUV(6, 0, 1, 2, 0);
    Mesh.SetFaceUV(7, 0, 3, 0, 2);
    //front faces
    Mesh.SetFaceUV(8, 0, 2, 1, 0);
    Mesh.SetFaceUV(9, 0, 0, 3, 2);
    //back faces
    Mesh.SetFaceUV(10, 0, 1, 2, 0);
    Mesh.SetFaceUV(11, 0, 3, 0, 2);
 
    //set normals
    Mesh.SetNormal(0, 0.0, 0.0, 1.0); //top faces
    Mesh.SetNormal(1, 0.0, 0.0, 1.0);
    Mesh.SetNormal(2, 0.0, 0.0, 1.0);
    Mesh.SetNormal(3, 0.0, 0.0, 1.0);
    Mesh.SetNormal(4, 0.0, 0.0, 1.0);
    Mesh.SetNormal(5, 0.0, 0.0, 1.0);
    Mesh.SetNormal(6, 0.0, 0.0, -1.0); //bottom faces
    Mesh.SetNormal(7, 0.0, 0.0, -1.0);
    Mesh.SetNormal(8, 0.0, 0.0, -1.0);
    Mesh.SetNormal(9, 0.0, 0.0, -1.0);
    Mesh.SetNormal(10, 0.0, 0.0, -1.0);
    Mesh.SetNormal(11, 0.0, 0.0, -1.0);
    Mesh.SetNormal(12, -1.0, 0.0, 0.0); //left faces
    Mesh.SetNormal(13, -1.0, 0.0, 0.0);
    Mesh.SetNormal(14, -1.0, 0.0, 0.0);
    Mesh.SetNormal(15, -1.0, 0.0, 0.0);
    Mesh.SetNormal(16, -1.0, 0.0, 0.0);
    Mesh.SetNormal(17, -1.0, 0.0, 0.0);
    Mesh.SetNormal(18, 1.0, 0.0, 0.0); //right faces
    Mesh.SetNormal(19, 1.0, 0.0, 0.0);
    Mesh.SetNormal(20, 1.0, 0.0, 0.0);
    Mesh.SetNormal(21, 1.0, 0.0, 0.0);
    Mesh.SetNormal(22, 1.0, 0.0, 0.0);
    Mesh.SetNormal(23, 1.0, 0.0, 0.0);
    Mesh.SetNormal(24, 0.0, -1.0, 0.0); //front faces
    Mesh.SetNormal(25, 0.0, -1.0, 0.0);
    Mesh.SetNormal(26, 0.0, -1.0, 0.0);
    Mesh.SetNormal(27, 0.0, -1.0, 0.0);
    Mesh.SetNormal(28, 0.0, -1.0, 0.0);
    Mesh.SetNormal(29, 0.0, -1.0, 0.0);
    Mesh.SetNormal(30, 0.0, 1.0, 0.0); //back faces
    Mesh.SetNormal(31, 0.0, 1.0, 0.0);
    Mesh.SetNormal(32, 0.0, 1.0, 0.0);
    Mesh.SetNormal(33, 0.0, 1.0, 0.0);
    Mesh.SetNormal(34, 0.0, 1.0, 0.0);
    Mesh.SetNormal(35, 0.0, 1.0, 0.0);
}
 
void FDatasmithExportHelper::CreateSimplePyramid( FDatasmithMesh& Mesh )
{
    int32 NumFaces = 5; //six quads on a box
    int32 NumTriangles = 6; //everything should be converted to triangles
    int32 NumVertex = 5; //eight shared vertex to create all the triangles
 
    //set the num of needed geometry vertex and faces
    Mesh.SetVerticesCount(NumVertex);
    Mesh.SetFacesCount(NumTriangles);
 
    // Set the position of each vertex
    Mesh.SetVertex(0, 0.0, 0.0, 0.0);
    Mesh.SetVertex(1, -50.0, -50.0, -100.0);
    Mesh.SetVertex(2, -50.0, 50.0, -100.0);
    Mesh.SetVertex(3, 50.0, 50.0, -100.0);
    Mesh.SetVertex(4, 50.0, -50.0, -100.0);
 
    // Set the num of needed UV vertex
    Mesh.SetUVCount(0, 4);
 
    //set the actual position of each uv vertex
    Mesh.SetUV(0, 0, 0.0, 0.0);
    Mesh.SetUV(0, 1, 0.0, 1.0);
    Mesh.SetUV(0, 2, 1.0, 1.0);
    Mesh.SetUV(0, 3, 1.0, 0.0);
 
 
    // Create polygons. Assign texture and texture UV indices.
 
    //We'll create three quads with material 0 and three quads with material 1
 
    //SetFace: face index, vert1, vert2, vert3, FaceId
    int32 FaceId = 0;
    Mesh.SetFace(0, 3, 2, 1, FaceId); //bottom face
    Mesh.SetFace(1, 1, 4, 3, FaceId);
    Mesh.SetFace(2, 1, 2, 0, FaceId); //left face
 
    FaceId = 1;
    Mesh.SetFace(3, 2, 3, 0, FaceId); //right face
    Mesh.SetFace(4, 3, 4, 0, FaceId); //front face
    Mesh.SetFace(5, 4, 1, 0, FaceId); //back face
 
 
    //set uv indexes for each face vertex
    //bottom faces
    Mesh.SetFaceUV(0, 0, 2, 1, 0);
    Mesh.SetFaceUV(1, 0, 0, 3, 2);
    //left faces
    Mesh.SetFaceUV(2, 0, 2, 1, 0);
    //right faces
    Mesh.SetFaceUV(3, 0, 1, 2, 0);
    //front faces
    Mesh.SetFaceUV(4, 0, 2, 1, 0);
    //back faces
    Mesh.SetFaceUV(5, 0, 1, 2, 0);
 
    //set normals
    Mesh.SetNormal(0, 0.0, 0.0, -1.0); //bottom faces
    Mesh.SetNormal(1, 0.0, 0.0, -1.0);
    Mesh.SetNormal(2, 0.0, 0.0, -1.0);
    Mesh.SetNormal(3, 0.0, 0.0, -1.0);
    Mesh.SetNormal(4, 0.0, 0.0, -1.0);
    Mesh.SetNormal(5, 0.0, 0.0, -1.0);
    Mesh.SetNormal(6, -1.0, 0.0, 0.0); //left faces
    Mesh.SetNormal(7, -1.0, 0.0, 0.0);
    Mesh.SetNormal(8, 0.0, 0.0, 1.0);
    Mesh.SetNormal(9, 1.0, 0.0, 0.0); //right faces
    Mesh.SetNormal(10, 1.0, 0.0, 0.0);
    Mesh.SetNormal(11, 0.0, 0.0, 1.0);
    Mesh.SetNormal(12, 0.0, 1.0, 0.0); //front faces
    Mesh.SetNormal(13, 0.0, 1.0, 0.0);
    Mesh.SetNormal(14, 0.0, 0.0, 1.0);
    Mesh.SetNormal(15, 0.0, -1.0, 0.0); //back faces
    Mesh.SetNormal(16, 0.0, -1.0, 0.0);
    Mesh.SetNormal(17, 0.0, 0.0, 1.0);
}