Test004.cpp

Solid colored box.

This example shows how to create an object that is colored by a single value.

A perspective camera is added to the scene with a transformation that orients the scene in such a way that the object (box) is in an isometric like orientation. Perspective cameras are not recommended because of strange perspectives when the scene is zoomed out so the objects are small.

The tooltip in the viewer contains no texture coordinate value, since to textures are used.

/*
 * Copyright 2018-2021 ANSYS, Inc. Unauthorized use, distribution, or duplication is prohibited.
 * 
 * Restricted Rights Legend
 *
 * Use, duplication, or disclosure of this
 * software and its documentation by the
 * Government is subject to restrictions as
 * set forth in subdivision [(b)(3)(ii)] of
 * the Rights in Technical Data and Computer
 * Software clause at 52.227-7013.
 */
#include <vector>
 
#include "GLTFWriter.h"
#include "test.h"
 
using namespace ANSYS::Nexus;
 
// Lighted solid colored box
TESTFUNC(SolidColor)
{
    GLTFWriter::GLTF *gltf = GLTFWriter::GLTF::Create("MyApp", "1.0", functionName.c_str(), type);
    if (!gltf)
        throw std::runtime_error("Can't create GLTF");
 
    // SCENE
    GLTFWriter::Scene *scene = GLTFWriter::Scene::Create(gltf, "TestScene", "m", 1.0, GLTFWriter::Scene::BT_SOLID, 0.5, 0.5, 0.5);
    if (!scene) {
        GLTFWriter::GLTF::Destroy(gltf);
        throw std::runtime_error("Can't create scene");
    }
 
    // LIGHTS
    {
        // LIGHT NODE
        GLTFWriter::Node *lightNode = GLTFWriter::Node::CreateLight(gltf);
        if (!lightNode || !scene->SetLight(lightNode)) {
            GLTFWriter::GLTF::Destroy(gltf);
            throw std::runtime_error("Can't create light");
        }
 
        // LIGHTS
        GLTFWriter::Light *light1 = GLTFWriter::Light::CreateAmbient(gltf);
        lightNode->AppendLight(light1);
 
        GLTFWriter::Light *light2 = GLTFWriter::Light::CreateDirectional(gltf, 1, 1, 1, -1, -1, -3);
        lightNode->AppendLight(light2);
    }
 
    // CAMERA
    {
        // CAMERA
        GLTFWriter::Camera *camera = GLTFWriter::Camera::CreatePerspective(gltf);
        // CAMERA NODE
        std::vector<double> mat(16);
        mat[0] = 0.635085;
        mat[1] = 0;
        mat[2] = -0.635085;
        mat[3] = 0;
        mat[4] = -0.366667;
        mat[5] = 0.733333;
        mat[6] = -0.366667;
        mat[7] = 0;
        mat[8] = 0.518545;
        mat[9] = 0.518545;
        mat[10] = 0.518545;
        mat[11] = 0;
        mat[12] = 2.59272;
        mat[13] = 2.59272;
        mat[14] = 2.59272;
        mat[15] = 1;
        GLTFWriter::Node *cameraNode = GLTFWriter::Node::CreateCamera(gltf, camera, "TestCamera", &mat[0]);
        scene->SetCamera(cameraNode);
    }
 
    // MESH NODE
    {
        // NODE
        GLTFWriter::Node *node = GLTFWriter::Node::CreateMesh(gltf, "3D Box");
        if (!node || !scene->AppendMesh(node)) {
            GLTFWriter::GLTF::Destroy(gltf);
            throw std::runtime_error("Can't create mesh node");
        }
 
        // MESH
        GLTFWriter::Mesh *mesh = GLTFWriter::Mesh::Create(gltf);
        if (!mesh || !node->AppendMesh(mesh)) {
            GLTFWriter::GLTF::Destroy(gltf);
            throw std::runtime_error("Can't create mesh");
        }
 
        // PRIMITIVE
        std::pair<GLTFWriter::Primitive *, GLTFWriter::Material *> pm = GLTFWriter::Test::CreateSolidColoredBoxPrimitive(gltf,   0, 0, 0,   1, 1, 1,   1, 0, 0, 0.5);
        mesh->AppendPrimitive(pm.first);
    }
 
    if (!gltf->Write()) {
        GLTFWriter::GLTF::Destroy(gltf);
        throw std::runtime_error("Error creating file");
    }
 
    GLTFWriter::GLTF::GLTFError error = gltf->GetError();
 
    GLTFWriter::GLTF::Destroy(gltf);
 
    if (error != GLTFWriter::GLTF::GLTF_ERROR_NONE)
        throw std::runtime_error("Error creating file");
}

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