## On this page # Test009 Last update: 16.07.2025 Lighted points. This example creates texture colored points with different sizes. Special attributes are used describing the points that allow the auto-generated shader to render the points. The points are defined by a single vertex and single size parameter. The shader takes this information and creates varying sized points that are perfectly spherical. <script src="/ansys/nexus/viewer-loader.js"></script> /\* \* 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 <cstdlib> \#include "GLTFWriter.h" \#include "test.h" using namespace ANSYS::Nexus; // Lighted points TESTFUNC(LightedPoints) { GLTFWriter::GLTF *gltf = [GLTFWriter::GLTF::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_g_l_t_f.xhtml#ab7ba6d114c76cb60baf41aa6f13e9494)("MyApp", "1.0", functionName.c_str(), type); if (!gltf) throw std::runtime_error("Can't create GLTF"); // TEXTURE std::vector<unsigned char> colors; colors.push_back(0); colors.push_back(0); colors.push_back(255); // blue colors.push_back(0); colors.push_back(255); colors.push_back(255); // cyan colors.push_back(0); colors.push_back(255); colors.push_back(0); // green colors.push_back(255); colors.push_back(255); colors.push_back(0); // yellow colors.push_back(255); colors.push_back(0); colors.push_back(0); // red GLTFWriter::Texture *rainbowGradientTexture = [GLTFWriter::Texture::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_texture.xhtml#a3d15e0e6ad83cd7d50bb81ce2d0f30c8)(gltf, [GLTFWriter::Texture::TF\_RGB](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_texture.xhtml#aba6db4f52b9f0a1a866bce302b6d8964aaa8ea9a0e6b83932a6a882b1655e8e59), (unsigned int)colors.size() / 3, &colors[0], false); // generate vertices, normals, and texture coordinates for a ball std::vector<float> vertices; std::vector<unsigned int> lines; std::vector<unsigned int> triangles; GLTFWriter::Test::MakeSphere(0, 0, 0, 0.5, 16, vertices, lines, triangles); const unsigned int numVertices = (unsigned int)vertices.size() / 3; std::vector<float> textureCoords(numVertices); // TEXCOORDS const double coordMin = -5; const double coordMax = 5; std::vector<float> texCoords; double coordInc = 1.0 / (numVertices - 1); double c = 0; for (unsigned int i = 0; i < numVertices; ++i) { texCoords.push_back((float)(coordMin + c * (coordMax - coordMin))); c += coordInc; } // POINTSIZE std::srand(0); const double sizeMin = 5; const double sizeMax = 20; std::vector<float> pointSizes; for (unsigned int i = 0; i < numVertices; ++i) pointSizes.push_back((float)((sizeMax - sizeMin) * (std::rand() % 10000) / 10000.0 + sizeMin)); // SCENE GLTFWriter::Scene *scene = [GLTFWriter::Scene::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_scene.xhtml#aac8bcb85d4361abba99053b3c56eb08b)(gltf, "TestScene", "m", 1.0, [GLTFWriter::Scene::BT\_SOLID](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_scene.xhtml#ac17baf491cdba3613b0aa39719a3dbd8aeea551002921bb989b3ed35678ec982b), 0.5, 0.5, 0.5); if (!scene) { [GLTFWriter::GLTF::Destroy](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_g_l_t_f.xhtml#a586171eb8e873e909db02a7eb4d80f5c)(gltf); throw std::runtime_error("Can't create scene"); } // LIGHTS { // LIGHT NODE GLTFWriter::Node *lightNode = [GLTFWriter::Node::CreateLight](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_node.xhtml#a7883624afdcaae45b6018944a040a01c)(gltf); if (!lightNode || !scene->SetLight(lightNode)) { [GLTFWriter::GLTF::Destroy](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_g_l_t_f.xhtml#a586171eb8e873e909db02a7eb4d80f5c)(gltf); throw std::runtime_error("Can't create light"); } // LIGHTS GLTFWriter::Light *light1 = [GLTFWriter::Light::CreateAmbient](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_light.xhtml#a14a825d32570498d64b6a427fb4f8207)(gltf); lightNode->AppendLight(light1); GLTFWriter::Light *light2 = [GLTFWriter::Light::CreateDirectional](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_light.xhtml#aa54e23609ac5f7a1a6808b62ee48163d)(gltf, 1, 1, 1, -1, -1, -3); lightNode->AppendLight(light2); } // CAMERA { // CAMERA GLTFWriter::Camera *camera = [GLTFWriter::Camera::CreateOrthographic](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_camera.xhtml#acab0b8344a7bb8b65c9690d221705377)(gltf); // CAMERA NODE std::vector<double> mat(16); mat[0] = 1; mat[1] = 0; mat[2] = 0; mat[3] = 0; mat[4] = 0; mat[5] = 1; mat[6] = 0; mat[7] = 0; mat[8] = 0; mat[9] = 0; mat[10] = 1; mat[11] = 0; mat[12] = 0; mat[13] = 0; mat[14] = 0; mat[15] = 1; GLTFWriter::Node *cameraNode = [GLTFWriter::Node::CreateCamera](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_node.xhtml#af6c4767cc8271d9d39816d278538197a)(gltf, camera, "TestCamera", &mat[0]); scene->SetCamera(cameraNode); } // NODE { GLTFWriter::Node *node = [GLTFWriter::Node::CreateMesh](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_node.xhtml#a4dd14791b2b9e65c115aa7a9e3f340e8)(gltf, "3D Points"); if (!node || !scene->AppendMesh(node)) { [GLTFWriter::GLTF::Destroy](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_g_l_t_f.xhtml#a586171eb8e873e909db02a7eb4d80f5c)(gltf); throw std::runtime_error("Can't create mesh node"); } // MESH GLTFWriter::Mesh *mesh = [GLTFWriter::Mesh::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_mesh.xhtml#a9f7803b1b1eb72e4005665ca33f42788)(gltf); if (!mesh || !node->AppendMesh(mesh)) { [GLTFWriter::GLTF::Destroy](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_g_l_t_f.xhtml#a586171eb8e873e909db02a7eb4d80f5c)(gltf); throw std::runtime_error("Can't create mesh"); } // TECHNIQUE GLTFWriter::Technique *technique = [GLTFWriter::Technique::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_technique.xhtml#a13382537cb3622195e7cf0bf33e202c2)(gltf); if (!technique || // TECHNIQUE STATES !technique->AppendState([GLTFWriter::State::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_state.xhtml#a8cefd28a7477d1ab51809a51b21b8019)(gltf, [GLTFWriter::State::ST\_BLENDENABLE](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_state.xhtml#affd67e37265c1883f760fd0c368ba718a333b0ebeb6a896a3b0b973da1f1ce56a), 1)) || !technique->AppendState([GLTFWriter::State::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_state.xhtml#a8cefd28a7477d1ab51809a51b21b8019)(gltf, [GLTFWriter::State::ST\_DEPTHTESTENABLE](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_state.xhtml#affd67e37265c1883f760fd0c368ba718a5a304a50ef0c9a98124f4c998ec47f3b), 1))) { [GLTFWriter::GLTF::Destroy](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_g_l_t_f.xhtml#a586171eb8e873e909db02a7eb4d80f5c)(gltf); throw std::runtime_error("Can't create technique"); } // MATERIAL GLTFWriter::Material *material = [GLTFWriter::Material::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_material.xhtml#a683cf8ee4a674e8e7a7b01c97797eecc)(gltf, technique); if (!material || // MATERIAL UNIFORM VALUES !material->AppendValue([GLTFWriter::Value::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_value.xhtml#aee78dae95614f843f10d5e19f9d55d61)(gltf, "texture0", rainbowGradientTexture->GetID()))) { [GLTFWriter::GLTF::Destroy](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_g_l_t_f.xhtml#a586171eb8e873e909db02a7eb4d80f5c)(gltf); throw std::runtime_error("Can't create material"); } // POSITION ATTRIBUTE GLTFWriter::Attribute *vertex = [GLTFWriter::Attribute::CreatePosition](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_attribute.xhtml#a2490057f37890b1dd7debe04ddf1fd6f)(gltf, numVertices, &vertices[0]); // TEXCOORD ATTRIBUTE GLTFWriter::Attribute *texCoord = [GLTFWriter::Attribute::CreateTextureCoord](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_attribute.xhtml#af4bd5279c34932ef6afd15a858d39a6c)(gltf, 0, numVertices, &texCoords[0]); float mn; float mx; mn = (float)coordMin; mx = (float)coordMax; if (!texCoord || !texCoord->SetMinMax([GLTFWriter::Attribute::AT\_FLOAT](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_attribute.xhtml#aa787c451052ac912fd9af91c4ff54ddba6d124c894e5bdc043eeebec0f852e857), &mn, &mx)) { [GLTFWriter::GLTF::Destroy](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_g_l_t_f.xhtml#a586171eb8e873e909db02a7eb4d80f5c)(gltf); throw std::runtime_error("Can't create textureCoord"); } // POINTSIZE ATTRIBUTE GLTFWriter::Attribute *pointSize = [GLTFWriter::Attribute::CreatePointSize](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_attribute.xhtml#a9c19f5df3d1335f023f9bec96a8f054f)(gltf, numVertices, &pointSizes[0]); // PRIMITIVE GLTFWriter::Primitive *primitive = [GLTFWriter::Primitive::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_primitive.xhtml#a11dce37f59247e26bd6973ba5d7fefeb)(gltf, [GLTFWriter::Primitive::PT\_POINTS](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_primitive.xhtml#a062b429c87d913e5adda11b381414c6ea0774f687d37a015adb12a7c57f157190), material); if (!primitive || !mesh->AppendPrimitive(primitive) || !primitive->AppendAttribute(vertex) || !primitive->AppendAttribute(texCoord) || !primitive->AppendAttribute(pointSize)) { [GLTFWriter::GLTF::Destroy](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_g_l_t_f.xhtml#a586171eb8e873e909db02a7eb4d80f5c)(gltf); throw std::runtime_error("Can't create primitive"); } } if (!gltf->Write()) { [GLTFWriter::GLTF::Destroy](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_g_l_t_f.xhtml#a586171eb8e873e909db02a7eb4d80f5c)(gltf); throw std::runtime_error("Error creating file"); } [GLTFWriter::GLTF::GLTFError](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_g_l_t_f.xhtml#acf83a4d185d959503cb9f3f2c2e9fafe) error = gltf->GetError(); [GLTFWriter::GLTF::Destroy](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_g_l_t_f.xhtml#a586171eb8e873e909db02a7eb4d80f5c)(gltf); if (error != [GLTFWriter::GLTF::GLTF\_ERROR\_NONE](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_g_l_t_f.xhtml#acf83a4d185d959503cb9f3f2c2e9fafea049c3b804e69ae05c02f4c2dedf4e0ea)) throw std::runtime_error("Error creating file"); } [ANSYS::Nexus::GLTFWriter::Attribute::CreatePosition](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_attribute.xhtml#a2490057f37890b1dd7debe04ddf1fd6f) static Attribute * CreatePosition(GLTF *gltf, unsigned int count, const float *data, Buffer *buffer=0) [ANSYS::Nexus::GLTFWriter::Attribute::CreatePointSize](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_attribute.xhtml#a9c19f5df3d1335f023f9bec96a8f054f) static Attribute * CreatePointSize(GLTF *gltf, unsigned int count, const float *data, Buffer *buffer=0) [ANSYS::Nexus::GLTFWriter::Attribute::AT\_FLOAT](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_attribute.xhtml#aa787c451052ac912fd9af91c4ff54ddba6d124c894e5bdc043eeebec0f852e857) @ AT_FLOAT 4 byte float **Definition:** [GLTFAttribute.h:42](_g_l_t_f_attribute_8h_source.xhtml#l00042) [ANSYS::Nexus::GLTFWriter::Attribute::CreateTextureCoord](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_attribute.xhtml#af4bd5279c34932ef6afd15a858d39a6c) static Attribute * CreateTextureCoord(GLTF *gltf, unsigned int num, unsigned int count, const float *data, Buffer *buffer=0) [ANSYS::Nexus::GLTFWriter::Camera::CreateOrthographic](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_camera.xhtml#acab0b8344a7bb8b65c9690d221705377) static Camera * CreateOrthographic(GLTF *gltf, const char *name=0, float xmag=1, float ymag=1, float zfar=1000, float znear=-1000) [ANSYS::Nexus::GLTFWriter::GLTF::Destroy](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_g_l_t_f.xhtml#a586171eb8e873e909db02a7eb4d80f5c) static void Destroy(GLTF *gltf) [ANSYS::Nexus::GLTFWriter::GLTF::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_g_l_t_f.xhtml#ab7ba6d114c76cb60baf41aa6f13e9494) static GLTF * Create(const char *application, const char *applicationVersion, const char *filePath, OutputType fileType=OT_AVZ) [ANSYS::Nexus::GLTFWriter::GLTF::GLTFError](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_g_l_t_f.xhtml#acf83a4d185d959503cb9f3f2c2e9fafe) GLTFError **Definition:** [GLTFGLTF.h:35](_g_l_t_f_g_l_t_f_8h_source.xhtml#l00035) [ANSYS::Nexus::GLTFWriter::GLTF::GLTF\_ERROR\_NONE](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_g_l_t_f.xhtml#acf83a4d185d959503cb9f3f2c2e9fafea049c3b804e69ae05c02f4c2dedf4e0ea) @ GLTF_ERROR_NONE No Error. **Definition:** [GLTFGLTF.h:36](_g_l_t_f_g_l_t_f_8h_source.xhtml#l00036) [ANSYS::Nexus::GLTFWriter::Light::CreateAmbient](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_light.xhtml#a14a825d32570498d64b6a427fb4f8207) static Light * CreateAmbient(GLTF *gltf, float colR=0.3, float colG=0.3, float colB=0.3) [ANSYS::Nexus::GLTFWriter::Light::CreateDirectional](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_light.xhtml#aa54e23609ac5f7a1a6808b62ee48163d) static Light * CreateDirectional(GLTF *gltf, float colR=1, float colG=1, float colB=1, float dirX=0, float dirY=0, float dirZ=-1, float specColR=1, float specColG=1, float specColB=1, float shininess=100) [ANSYS::Nexus::GLTFWriter::Material::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_material.xhtml#a683cf8ee4a674e8e7a7b01c97797eecc) static Material * Create(GLTF *gltf, Technique *technique) [ANSYS::Nexus::GLTFWriter::Mesh::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_mesh.xhtml#a9f7803b1b1eb72e4005665ca33f42788) static Mesh * Create(GLTF *gltf) [ANSYS::Nexus::GLTFWriter::Node::CreateMesh](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_node.xhtml#a4dd14791b2b9e65c115aa7a9e3f340e8) static Node * CreateMesh(GLTF *gltf, const char *name=0, bool visible=true, const double *matrix=0) [ANSYS::Nexus::GLTFWriter::Node::CreateLight](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_node.xhtml#a7883624afdcaae45b6018944a040a01c) static Node * CreateLight(GLTF *gltf) [ANSYS::Nexus::GLTFWriter::Node::CreateCamera](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_node.xhtml#af6c4767cc8271d9d39816d278538197a) static Node * CreateCamera(GLTF *gltf, Camera *camera, const char *name=0, const double *matrix=0) [ANSYS::Nexus::GLTFWriter::Primitive::PT\_POINTS](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_primitive.xhtml#a062b429c87d913e5adda11b381414c6ea0774f687d37a015adb12a7c57f157190) @ PT_POINTS Treats each vertex as a single point. **Definition:** [GLTFMesh.h:35](_g_l_t_f_mesh_8h_source.xhtml#l00035) [ANSYS::Nexus::GLTFWriter::Primitive::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_primitive.xhtml#a11dce37f59247e26bd6973ba5d7fefeb) static Primitive * Create(GLTF *gltf, PrimitiveType type, Material *material, Index *indices=0, bool isPickable=true) [ANSYS::Nexus::GLTFWriter::Scene::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_scene.xhtml#aac8bcb85d4361abba99053b3c56eb08b) static Scene * Create(GLTF *gltf, const char *name=0, const char *units=0, float scale=1, Scene::BackgroundType backgroundType=Scene::BT_NONE, float r1=0, float g1=0, float b1=0, float r2=0, float g2=0, float b2=0) [ANSYS::Nexus::GLTFWriter::Scene::BT\_SOLID](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_scene.xhtml#ac17baf491cdba3613b0aa39719a3dbd8aeea551002921bb989b3ed35678ec982b) @ BT_SOLID Make solid color from color 1. **Definition:** [GLTFScene.h:35](_g_l_t_f_scene_8h_source.xhtml#l00035) [ANSYS::Nexus::GLTFWriter::State::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_state.xhtml#a8cefd28a7477d1ab51809a51b21b8019) static State * Create(GLTF *gltf, StateType type, double v1, double v2=0, double v3=0, double v4=0) [ANSYS::Nexus::GLTFWriter::State::ST\_BLENDENABLE](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_state.xhtml#affd67e37265c1883f760fd0c368ba718a333b0ebeb6a896a3b0b973da1f1ce56a) @ ST_BLENDENABLE Enables blending of fragment colors. Possible values are: **Definition:** [GLTFTechnique.h:166](_g_l_t_f_technique_8h_source.xhtml#l00166) [ANSYS::Nexus::GLTFWriter::State::ST\_DEPTHTESTENABLE](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_state.xhtml#affd67e37265c1883f760fd0c368ba718a5a304a50ef0c9a98124f4c998ec47f3b) @ ST_DEPTHTESTENABLE Enables testing of depth buffer. Possible values are: **Definition:** [GLTFTechnique.h:186](_g_l_t_f_technique_8h_source.xhtml#l00186) [ANSYS::Nexus::GLTFWriter::Technique::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_technique.xhtml#a13382537cb3622195e7cf0bf33e202c2) static Technique * Create(GLTF *gltf, Program *program=0, bool is2D=false) [ANSYS::Nexus::GLTFWriter::Texture::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_texture.xhtml#a3d15e0e6ad83cd7d50bb81ce2d0f30c8) static Texture * Create(GLTF *gltf, TextureFormat format, TextureTarget target, Sampler *sampler, Image *image) [ANSYS::Nexus::GLTFWriter::Texture::TF\_RGB](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_texture.xhtml#aba6db4f52b9f0a1a866bce302b6d8964aaa8ea9a0e6b83932a6a882b1655e8e59) @ TF_RGB 3 unsigned chars per pixel. **Definition:** [GLTFTexture.h:34](_g_l_t_f_texture_8h_source.xhtml#l00034) [ANSYS::Nexus::GLTFWriter::Value::Create](class_a_n_s_y_s_1_1_nexus_1_1_g_l_t_f_writer_1_1_value.xhtml#aee78dae95614f843f10d5e19f9d55d61) static Value * Create(GLTF *gltf, const char *name, const Value *value=0)