C++ (Cpp) lib3ds_vector_normal Examples

Example #1

File: lib3ds_mesh.c Project: AlexBobkov/OpenSceneGraph

void
lib3ds_mesh_calculate_face_normals(Lib3dsMesh *mesh, float (*face_normals)[3]) {
    int i;

    if (!mesh->nfaces) {
        return;
    }
    for (i = 0; i < mesh->nfaces; ++i) {
        lib3ds_vector_normal(
            face_normals[i],
            mesh->vertices[mesh->faces[i].index[0]],
            mesh->vertices[mesh->faces[i].index[1]],
            mesh->vertices[mesh->faces[i].index[2]]
        );
    }
}

Example #2

File: mesh.c Project: mcu786/my_OpenPilot_mods

/*!
 * \ingroup mesh
 */
Lib3dsBool
lib3ds_mesh_read(Lib3dsMesh *mesh, Lib3dsIo *io)
{
  Lib3dsChunk c;
  Lib3dsWord chunk;

  if (!lib3ds_chunk_read_start(&c, LIB3DS_N_TRI_OBJECT, io)) {
    return(LIB3DS_FALSE);
  }

  while ((chunk=lib3ds_chunk_read_next(&c, io))!=0) {
    switch (chunk) {
      case LIB3DS_MESH_MATRIX:
        {
          int i,j;
          
          lib3ds_matrix_identity(mesh->matrix);
          for (i=0; i<4; i++) {
            for (j=0; j<3; j++) {
              mesh->matrix[i][j]=lib3ds_io_read_float(io);
            }
          }
        }
        break;
      case LIB3DS_MESH_COLOR:
        {
          mesh->color=lib3ds_io_read_byte(io);
        }
        break;
      case LIB3DS_POINT_ARRAY:
        {
          unsigned i,j;
          unsigned points;
          
          lib3ds_mesh_free_point_list(mesh);
          points=lib3ds_io_read_word(io);
          if (points) {
            if (!lib3ds_mesh_new_point_list(mesh, points)) {
              LIB3DS_ERROR_LOG;
              return(LIB3DS_FALSE);
            }
            for (i=0; i<mesh->points; ++i) {
              for (j=0; j<3; ++j) {
                mesh->pointL[i].pos[j]=lib3ds_io_read_float(io);
              }
            }
            ASSERT((!mesh->flags) || (mesh->points==mesh->flags));
            ASSERT((!mesh->texels) || (mesh->points==mesh->texels));
          }
        }
        break;
      case LIB3DS_POINT_FLAG_ARRAY:
        {
          unsigned i;
          unsigned flags;
          
          lib3ds_mesh_free_flag_list(mesh);
          flags=lib3ds_io_read_word(io);
          if (flags) {
            if (!lib3ds_mesh_new_flag_list(mesh, flags)) {
              LIB3DS_ERROR_LOG;
              return(LIB3DS_FALSE);
            }
            for (i=0; i<mesh->flags; ++i) {
              mesh->flagL[i]=lib3ds_io_read_word(io);
            }
            ASSERT((!mesh->points) || (mesh->flags==mesh->points));
            ASSERT((!mesh->texels) || (mesh->flags==mesh->texels));
          }
        }
        break;
      case LIB3DS_FACE_ARRAY:
        {
          lib3ds_chunk_read_reset(&c, io);
          if (!face_array_read(mesh, io)) {
            return(LIB3DS_FALSE);
          }
        }
        break;
      case LIB3DS_MESH_TEXTURE_INFO:
        {
          int i,j;

          for (i=0; i<2; ++i) {
            mesh->map_data.tile[i]=lib3ds_io_read_float(io);
          }
          for (i=0; i<3; ++i) {
            mesh->map_data.pos[i]=lib3ds_io_read_float(io);
          }
          mesh->map_data.scale=lib3ds_io_read_float(io);

          lib3ds_matrix_identity(mesh->map_data.matrix);
          for (i=0; i<4; i++) {
            for (j=0; j<3; j++) {
              mesh->map_data.matrix[i][j]=lib3ds_io_read_float(io);
            }
          }
          for (i=0; i<2; ++i) {
            mesh->map_data.planar_size[i]=lib3ds_io_read_float(io);
          }
          mesh->map_data.cylinder_height=lib3ds_io_read_float(io);
        }
        break;
      case LIB3DS_TEX_VERTS:
        {
          unsigned i;
          unsigned texels;
          
          lib3ds_mesh_free_texel_list(mesh);
          texels=lib3ds_io_read_word(io);
          if (texels) {
            if (!lib3ds_mesh_new_texel_list(mesh, texels)) {
              LIB3DS_ERROR_LOG;
              return(LIB3DS_FALSE);
            }
            for (i=0; i<mesh->texels; ++i) {
              mesh->texelL[i][0]=lib3ds_io_read_float(io);
              mesh->texelL[i][1]=lib3ds_io_read_float(io);
            }
            ASSERT((!mesh->points) || (mesh->texels==mesh->points));
            ASSERT((!mesh->flags) || (mesh->texels==mesh->flags));
          }
        }
        break;
      default:
        lib3ds_chunk_unknown(chunk);
    }
  }
  {
    unsigned j;

    for (j=0; j<mesh->faces; ++j) {
      ASSERT(mesh->faceL[j].points[0]<mesh->points);
      ASSERT(mesh->faceL[j].points[1]<mesh->points);
      ASSERT(mesh->faceL[j].points[2]<mesh->points);
      lib3ds_vector_normal(
        mesh->faceL[j].normal,
        mesh->pointL[mesh->faceL[j].points[0]].pos,
        mesh->pointL[mesh->faceL[j].points[1]].pos,
        mesh->pointL[mesh->faceL[j].points[2]].pos
      );
    }
  }

  if (lib3ds_matrix_det(mesh->matrix) < 0.0)
  {
    /* Flip X coordinate of vertices if mesh matrix 
       has negative determinant */
    Lib3dsMatrix inv_matrix, M;
    Lib3dsVector tmp;
    unsigned i;

    lib3ds_matrix_copy(inv_matrix, mesh->matrix);
    lib3ds_matrix_inv(inv_matrix);

    lib3ds_matrix_copy(M, mesh->matrix);
    lib3ds_matrix_scale_xyz(M, -1.0f, 1.0f, 1.0f);
    lib3ds_matrix_mult(M, inv_matrix);

    for (i=0; i<mesh->points; ++i) {
      lib3ds_vector_transform(tmp, M, mesh->pointL[i].pos);
      lib3ds_vector_copy(mesh->pointL[i].pos, tmp);
    }
  }

  lib3ds_chunk_read_end(&c, io);

  return(LIB3DS_TRUE);
}