1.先将点云保存为.off文件,例如:
OFF 21496 0 0 1 13 20 1 13 21 1 13 22 1 13 23 1 14 19 1 14 20
2.利用Meshlab可视化.off文件,
然后利用Meshlab将点云重建为网格,具体操作如下:
(1)在工具栏上选择Filter,然后选择Normals,Curvalures and Orientation,再选择Smooths normals on a point sets.
(2)继续选择Filter,然后选择Remeshing, Simplification and Reconstruction,再选择Surface Reconstruction: Ball Pivoting.
(3)选择工具栏下黄色部分
(4)选择工具栏Render,选择Enable Screen Space Ambient Occlusion,然后Shaders下选择depthmap.gdp或者其它的。
3.利用MATLAB可视化生成的网格。
编写函数:obj__read.m
function [node_xyz, face_node ]= obj__read( input_file_name ) %*****************************************************************************80 % %% OBJ_DISPLAY displays the faces of a shape defined by an OBJ file. % % Usage: % % obj_display ( 'file.obj' ) % % Licensing: % % This code is distributed under the GNU LGPL license. % % Modified: % % 27 September 2008 % % Author: % % John Burkardt % % Get sizes. % [ node_num, face_num, normal_num, order_max ] = obj_size ( input_file_name ); % % Get the data. % [ node_xyz, face_order, face_node ] = ... obj_read ( input_file_name, node_num, face_num, normal_num, order_max ); % % FACE_NODE may contain polygons of different orders. % To make the call to PATCH, we will assume all the polygons are the same order. % To do so, we'll simply "stutter" the first node in each face list. % for face = 1 : face_num face_node(face_order(face)+1:order_max,face) = face_node(1,face); end % % If any node index is still less than 1, set the whole face to 1's. % We're giving up on this presumably meaningless face, but we need to % do it in a way that keeps MATLAB happy! % for face = 1 : face_num for i = 1 : order_max face_node(i,face) = max ( face_node(i,face), 1 ); end end % % Display the shape. % The TITLE function will interpret underscores in the title. % We need to unescape such escape sequences! return end function c = ch_cap ( c ) %*****************************************************************************80 % %% CH_CAP capitalizes a single character. % % Parameters: % % Input, character C, the character to capitalize. % Output, character C, the capitalized character. % if ( 'a' <= c && c <= 'z' ) c = c + 'A' - 'a'; end return end function truefalse = ch_eqi ( c1, c2 ) %*****************************************************************************80 % %% CH_EQI is a case insensitive comparison of two characters for equality. % % Example: % % CH_EQI ( 'A', 'a' ) is TRUE. % % % Parameters: % % Input, character C1, C2, the characters to compare. % % Output, logical TRUEFALSE, is TRUE (1) if the characters are equal. % FALSE = 0; TRUE = 1; if ( ch_cap ( c1 ) == ch_cap ( c2 ) ) truefalse = TRUE; else truefalse = FALSE; end return end function value = ch_index ( s, c ) %*****************************************************************************80 % %% CH_INDEX is the first occurrence of a character in a string. % % Licensing: % % This code is distributed under the GNU LGPL license. % % Modified: % % 01 May 2004 % % Author: % % John Burkardt % % Parameters: % % Input, string S, the string to be searched. % % Input, character C, the character to be searched for. % % Output, integer VALUE, the location of the first occurrence of C % in the string, or 0 if C does not occur. % value = 0; for i = 1 : length ( s ) if ( s(i:i) == c ) value = i; return end end return end function value = ch_is_control ( ch ) %*****************************************************************************80 % %% CH_IS_CONTROL is TRUE if a character is a control character. % % Discussion: % % A "control character" has ASCII code <= 31 or 127 <= ASCII code. % % Licensing: % % This code is distributed under the GNU LGPL license. % % Modified: % % 27 September 2008 % % Author: % % John Burkardt % % Parameters: % % Input, character CH, the character to be tested. % % Output, integer CH_IS_CONTROL, TRUE if the character is a control % character, and FALSE otherwise. % if ( ch <= 31 || 127 <= ch ) value = 1; else value = 0; end return end function truefalse = ch_is_digit ( c ) %*****************************************************************************80 % % CH_IS_DIGIT returns TRUE if the character C is a digit. % % Licensing: % % This code is distributed under the GNU LGPL license. % % Parameters: % % Input, character C, a character. % % Output, integer TRUEFALSE, is TRUE (1) if C is a digit, FALSE (0) otherwise. % TRUE = 1; FALSE = 0; if ( '0' <= c && c <= '9' ) truefalse = TRUE; else truefalse = FALSE; end return end function digit = ch_to_digit ( c ) %*****************************************************************************80 % %% CH_TO_DIGIT returns the integer value of a base 10 digit. % % Example: % % C DIGIT % --- ----- % '0' 0 % '1' 1 % ... ... % '9' 9 % ' ' 0 % 'X' -1 % % Licensing: % % This code is distributed under the GNU LGPL license. % % Modified: % % 22 November 2003 % % Author: % % John Burkardt % % Parameters: % % Input, character C, the decimal digit, '0' through '9' or blank % are legal. % % Output, integer DIGIT, the corresponding integer value. If C was % 'illegal', then DIGIT is -1. % if ( '0' <= c && c <= '9' ) digit = c - '0'; elseif ( c == ' ' ) digit = 0; else digit = -1; end return end function [ node_xyz, face_order, face_node, normal_vector, vertex_normal ] = ... obj_read ( input_file_name, node_num, face_num, normal_num, order_max ) %*****************************************************************************80 % %% OBJ_READ reads graphics information from a Wavefront OBJ file. % % Discussion: % % It is intended that the information read from the file can % either start a whole new graphics object, or simply be added % to a current graphics object via the '<<' command. % % This is controlled by whether the input values have been zeroed % out or not. This routine simply tacks on the information it % finds to the current graphics object. % % Example: % % # magnolia.obj % % v -3.269770 -39.572201 0.876128 % v -3.263720 -39.507999 2.160890 % ... % v 0.000000 -9.988540 0.000000 % vn 1.0 0.0 0.0 % ... % vn 0.0 1.0 0.0 % % f 8 9 11 10 % f 12 13 15 14 % ... % f 788 806 774 % % Licensing: % % This code is distributed under the GNU LGPL license. % % % Parameters: % % Input, string INPUT_FILE_NAME, the name of the input file. % Input, integer NODE_NUM, the number of points. % Input, integer FACE_NUM, the number of faces. % Input, integer NORMAL_NUM, the number of normal vectors. % Input, integer ORDER_MAX, the maximum number of vertices per face. % Output, real NODE_XYZ(3,NODE_NUM), the coordinates of points. % Output, integer FACE_ORDER(FACE_NUM), the number of vertices per face. % Output, integer FACE_NODE(ORDER_MAX,FACE_NUM), the nodes making faces. % Output, real NORMAL_VECTOR(3,NORMAL_NUM), normal vectors. % Output, integer VERTEX_NORMAL(ORDER_MAX,FACE_NUM), the indices of normal % vectors per vertex. % face = 0; node = 0; normal = 0; text_num = 0; face_node = zeros ( order_max, face_num ); face_order = zeros ( face_num, 1 ); node_xyz = zeros ( 3, node_num ); normal_vector = zeros ( 3, normal_num ); vertex_normal = zeros ( order_max, face_num ); % % If no file input, try to get one from the user. % if ( nargin < 1 ) input_file_name = input ( 'Enter the name of the ASCII OBJ file.' ); if ( isempty ( input_file_name ) ) return end end % % Open the file. % input_file_unit = fopen ( input_file_name, 'r' ); if ( input_file_unit < 0 ) fprintf ( 1, ' ' ); fprintf ( 1, 'OBJ_READ - Fatal error! ' ); fprintf ( 1, ' Could not open the file "%s". ', input_file_name ); error ( 'OBJ_READ - Fatal error!' ); end % % Read a line of text from the file. % while ( 1 ) text = fgetl ( input_file_unit ); if ( text == -1 ) break end text_num = text_num + 1; % % Replace any control characters (in particular, TAB's) by blanks. % s_control_blank ( text ); done = 1; word_index = 0; % % Read a word from the line. % [ word, done ] = word_next_read ( text, done ); % % If no more words in this line, read a new line. % if ( done ) continue end % % If this word begins with '#' or '$', then it's a comment. Read a new line. % if ( word(1) == '#' || word(1) == '$' ) continue end word_index = word_index + 1; if ( word_index == 1 ) word_one = word; end % % BEVEL % Bevel interpolation. % if ( s_eqi ( word_one, 'BEVEL' ) ) % % BMAT % Basis matrix. % elseif ( s_eqi ( word_one, 'BMAT' ) ) % % C_INTERP % Color interpolation. % elseif ( s_eqi ( word_one, 'C_INTERP' ) ) % % CON % Connectivity between free form surfaces. % elseif ( s_eqi ( word_one, 'CON' ) ) % % CSTYPE % Curve or surface type. % elseif ( s_eqi ( word_one, 'CSTYPE' ) ) % % CTECH % Curve approximation technique. % elseif ( s_eqi ( word_one, 'CTECH' ) ) % % CURV % Curve. % elseif ( s_eqi ( word_one, 'CURV' ) ) % % CURV2 % 2D curve. % elseif ( s_eqi ( word_one, 'CURV2' ) ) % % D_INTERP % Dissolve interpolation. % elseif ( s_eqi ( word_one, 'D_INTERP' ) ) % % DEG % Degree. % elseif ( s_eqi ( word_one, 'DEG' ) ) % % END % End statement. % elseif ( s_eqi ( word_one, 'END' ) ) % % F V1 V2 V3 ... % or % F V1/VT1/VN1 V2/VT2/VN2 ... % or % F V1//VN1 V2//VN2 ... % % Face. % A face is defined by the vertices. % Optionally, slashes may be used to include the texture vertex % and vertex normal indices. % elseif ( s_eqi ( word_one, 'F' ) ) face = face + 1; vertex = 0; while ( 1 ) [ word, done ] = word_next_read ( text, done ); if ( done ) break end vertex = vertex + 1; order_max = max ( order_max, vertex ); % % Locate the slash characters in the word, if any. % i1 = ch_index ( word, '/' ); if ( 0 < i1 ) i2 = ch_index ( word(i1+1), '/' ) + i1; else i2 = 0; end % % Read the vertex index. % itemp = s_to_i4 ( word ); face_node(vertex,face) = itemp; face_order(face) = face_order(face) + 1; % % If there are two slashes, then read the data following the second one. % if ( 0 < i2 ) itemp = s_to_i4 ( word(i2+1) ); vertex_normal(vertex,face) = itemp; end end % % G % Group name. % elseif ( s_eqi ( word_one, 'G' ) ) % % HOLE % Inner trimming loop. % elseif ( s_eqi ( word_one, 'HOLE' ) ) % % L % A line, described by a sequence of vertex indices. % Are the vertex indices 0 based or 1 based? % elseif ( s_eqi ( word_one, 'L' ) ) % % LOD % Level of detail. % elseif ( s_eqi ( word_one, 'LOD' ) ) % % MG % Merging group. % elseif ( s_eqi ( word_one, 'MG' ) ) % % MTLLIB % Material library. % elseif ( s_eqi ( word_one, 'MTLLIB' ) ) % % O % Object name. % elseif ( s_eqi ( word_one, 'O' ) ) % % P % Point. % elseif ( s_eqi ( word_one, 'P' ) ) % % PARM % Parameter values. % elseif ( s_eqi ( word_one, 'PARM' ) ) % % S % Smoothing group. % elseif ( s_eqi ( word_one, 'S' ) ) % % SCRV % Special curve. % elseif ( s_eqi ( word_one, 'SCRV' ) ) % % SHADOW_OBJ % Shadow casting. % elseif ( s_eqi ( word_one, 'SHADOW_OBJ' ) ) % % SP % Special point. % elseif ( s_eqi ( word_one, 'SP' ) ) % % STECH % Surface approximation technique. % elseif ( s_eqi ( word_one, 'STECH' ) ) % % STEP % Stepsize. % elseif ( s_eqi ( word_one, 'STEP' ) ) % % SURF % Surface. % elseif ( s_eqi ( word_one, 'SURF' ) ) % % TRACE_OBJ % Ray tracing. % elseif ( s_eqi ( word_one, 'TRACE_OBJ' ) ) % % TRIM % Outer trimming loop. % elseif ( s_eqi ( word_one, 'TRIM' ) ) % % USEMTL % Material name. % elseif ( s_eqi ( word_one, 'USEMTL' ) ) % % V X Y Z % Geometric vertex. % elseif ( s_eqi ( word_one, 'V' ) ) node = node + 1; for i = 1 : 3 [ word, done ] = word_next_read ( text, done ); temp = s_to_r8 ( word ); node_xyz(i,node) = temp; end % % VN % Vertex normals. % elseif ( s_eqi ( word_one, 'VN' ) ) normal = normal + 1; for i = 1 : 3 [ word, done ] = word_next_read ( text, done ); temp = s_to_r8 ( word ); normal_vector(i,normal) = temp; end % % VT % Vertex texture. % elseif ( s_eqi ( word_one, 'VT' ) ) % % VP % Parameter space vertices. % elseif ( s_eqi ( word_one, 'VP' ) ) % % Unrecognized keyword. % else end end fclose ( input_file_unit ); return end function [ node_num, face_num, normal_num, order_max ] = obj_size ( ... input_file_name ) %*****************************************************************************80 % %% OBJ_SIZE determines sizes of graphics objects in an Alias OBJ file. % % Discussion: % % The only items of interest to this routine are vertices, % faces, and normal vectors. % % Example: % % # magnolia.obj % % v -3.269770 -39.572201 0.876128 % v -3.263720 -39.507999 2.160890 % ... % v 0.000000 -9.988540 0.000000 % % vn 1.0 0.0 0.0 % ... % vn 0.0 1.0 0.0 % % f 8 9 11 10 % f 12 13 15 14 % ... % f 788 806 774 % % Licensing: % % This code is distributed under the GNU LGPL license. % % Modified: % % 26 September 2008 % % Author: % % John Burkardt % % Parameters: % % Input, string INPUT_FILE_NAME, the input file name. % % Output, integer NODE_NUM, the number of points. % % Output, integer FACE_NUM, the number of faces. % % Output, integer NORMAL_NUM, the number of normal vectors. % % Output, integer ORDER_MAX, the maximum face order. % face_num = 0; node_num = 0; normal_num = 0; order_max = 0; text_num = 0; % % If no file input, try to get one from the user. % if ( nargin < 1 ) input_file_name = input ( 'Enter the name of the ASCII OBJ file.' ); if ( isempty ( input_file_name ) ) return end end % % Open the file. % input_file_unit = fopen ( input_file_name, 'r' ); if ( input_file_unit < 0 ) fprintf ( 1, ' ' ); fprintf ( 1, 'OBJ_SIZE - Fatal error! ' ); fprintf ( 1, ' Could not open the file "%s". ', input_file_name ); error ( 'OBJ_SIZE - Fatal error!' ); end % % Read a line of text from the file. % while ( 1 ) text = fgetl ( input_file_unit ); if ( text == -1 ) break end text_num = text_num + 1; % % Replace any control characters (in particular, TABs) by blanks. % s_control_blank ( text ); done = 1; word_index = 0; % % Read a word from the line. % [ word, done ] = word_next_read ( text, done ); % % If no more words in this line, read a new line. % if ( done ) continue end % % If this word begins with '#' or '$', then it is a comment. Read a new line. % if ( word(1) == '#' || word(1) == '$' ) continue end word_index = word_index + 1; if ( word_index == 1 ) word_one = word; end % % F V1 V2 V3 ... % or % F V1/VT1/VN1 V2/VT2/VN2 ... % or % F V1//VN1 V2//VN2 ... % % Face. % A face is defined by the vertices. % Optionally, slashes may be used to include the texture vertex % and vertex normal indices. % if ( s_eqi ( word_one, 'F' ) ) face_num = face_num + 1; vertex = 0; while ( 1 ) [ word, done ] = word_next_read ( text, done ); if ( done ) break end vertex = vertex + 1; order_max = max ( order_max, vertex ); % % Locate the slash characters in the word, if any. % i1 = ch_index ( word, '/' ); if ( 0 < i1 ) i2 = ch_index ( word(i1+1), '/' ) + i1; else i2 = 0; end % % Read the vertex index. % s_to_i4 ( word ); % % If there are two slashes, then read the data following the second one. % if ( 0 < i2 ) s_to_i4 ( word(i2+1) ); end end % % V X Y Z W % Geometric vertex. % elseif ( s_eqi ( word_one, 'V' ) ) node_num = node_num + 1; continue % % VN % Vertex normals. % elseif ( s_eqi ( word_one, 'VN' ) ) normal_num = normal_num + 1; continue end end fclose ( input_file_unit ); return end function s = s_control_blank ( s ) %*****************************************************************************80 % %% S_CONTROL_BLANK replaces control characters with blanks. % % Discussion: % % A "control character" has ASCII code <= 31 or 127 <= ASCII code. % % Licensing: % % This code is distributed under the GNU LGPL license. % % Modified: % % 27 September 2008 % % Author: % % John Burkardt % % Parameters: % % Input/output, string S, the string to be transformed. % s_length = s_len_trim ( s ); for i = 1 : s_length if ( ch_is_control ( s(i) ) ) s(i) = ' '; end end return end function value = s_eqi ( s1, s2 ) %*****************************************************************************80 % %% S_EQI is a case insensitive comparison of two strings for equality. % % Example: % % S_EQI ( 'Anjana', 'ANJANA' ) is TRUE. % % Licensing: % % This code is distributed under the GNU LGPL license. % % Modified: % % 30 April 2004 % % Author: % % John Burkardt % % Parameters: % % Input, string S1, S2, the strings to compare. % % Output, logical VALUE, is TRUE if the strings are equal. % FALSE = 0; TRUE = 1; len1 = length ( s1 ); len2 = length ( s2 ); lenc = min ( len1, len2 ); for i = 1 : lenc c1 = ch_cap ( s1(i) ); c2 = ch_cap ( s2(i) ); if ( c1 ~= c2 ) value = FALSE; return end end for i = lenc + 1 : len1 if ( s1(i) ~= ' ' ) value = FALSE; return end end for i = lenc + 1 : len2 if ( s2(i) ~= ' ' ) value = FALSE; return end end value = TRUE; return end function len = s_len_trim ( s ) %*****************************************************************************80 % %% S_LEN_TRIM returns the length of a character string to the last nonblank. % % Licensing: % % This code is distributed under the GNU LGPL license. % % Modified: % % 14 June 2003 % % Author: % % John Burkardt % % Parameters: % % Input, string S, the string to be measured. % % Output, integer LEN, the length of the string up to the last nonblank. % len = length ( s ); while ( 0 < len ) if ( s(len) ~= ' ' ) return end len = len - 1; end return end function ival = s_to_i4 ( s ) %*****************************************************************************80 % %% S_TO_I4 reads an integer value from a string. % % Parameters: % % Input, string S, a string to be examined. % % Output, integer IVAL, the integer value read from the string. % sgn = 1; state = 0; ival = 0; i = 0; while ( i < s_len_trim ( s ) ) i = i + 1; c = s(i); if ( state == 0 ) if ( c == ' ' ) elseif ( c == '-' ) state = 1; sgn = -1; elseif ( c == '+' ) state = 1; sgn = +1; elseif ( '0' <= c && c <= '9' ) state = 2; ival = c - '0'; else fprintf ( ' ' ); fprintf ( 'S_TO_I4 - Fatal error! ' ); fprintf ( ' Illegal character %c while in state %d. ', c, state ); return; end % % Have read the sign, now expecting the first digit. % elseif ( state == 1 ) if ( c == ' ' ) elseif ( '0' <= c && c <= '9' ) state = 2; ival = c - '0'; else fprintf ( ' ' ); fprintf ( 'S_TO_I4 - Fatal error! ' ); fprintf ( ' Illegal character %c while in state %d. ', c, state ); return end % % Have read at least one digit, expecting more. % elseif ( state == 2 ) if ( '0' <= c && c <= '9' ) ival = 10 * ival + c - '0'; else ival = sgn * ival; return; end end end % % If we read all the characters in the string, see if we're OK. % if ( state ~= 2 ) fprintf ( ' ' ); fprintf ( 'S_TO_I4 - Fatal error! ' ); fprintf ( ' Did not read enough information to define an integer! ' ); return; end ival = sgn * ival; return end function [ r, lchar, ierror ] = s_to_r8 ( s ) %*****************************************************************************80 % %% S_TO_R8 reads an R8 from a string. % % Discussion: % % This routine will read as many characters as possible until it reaches % the end of the string, or encounters a character which cannot be % part of the real number. % % Legal input is: % % 1 blanks, % 2 '+' or '-' sign, % 2.5 spaces % 3 integer part, % 4 decimal point, % 5 fraction part, % 6 'E' or 'e' or 'D' or 'd', exponent marker, % 7 exponent sign, % 8 exponent integer part, % 9 exponent decimal point, % 10 exponent fraction part, % 11 blanks, % 12 final comma or semicolon. % % with most quantities optional. % % Example: % % S R % % '1' 1.0 % ' 1 ' 1.0 % '1A' 1.0 % '12,34,56' 12.0 % ' 34 7' 34.0 % '-1E2ABCD' -100.0 % '-1X2ABCD' -1.0 % ' 2E-1' 0.2 % '23.45' 23.45 % '-4.2E+2' -420.0 % '17d2' 1700.0 % '-14e-2' -0.14 % 'e2' 100.0 % '-12.73e-9.23' -12.73 * 10.0**(-9.23) % % Licensing: % % This code is distributed under the GNU LGPL license. % % Modified: % % 22 November 2003 % % Author: % % John Burkardt % % Parameters: % % Input, string S, the string containing the % data to be read. Reading will begin at position 1 and % terminate at the end of the string, or when no more % characters can be read to form a legal real. Blanks, % commas, or other nonnumeric data will, in particular, % cause the conversion to halt. % % Output, real R, the value that was read from the string. % % Output, integer LCHAR, the number of characters of S that were used to form R. % % Output, integer IERROR, is 0 if no error occurred. % s_length = s_len_trim ( s ); ierror = 0; lchar = -1; isgn = 1; rtop = 0.0; rbot = 1.0; jsgn = 1; jtop = 0; jbot = 1; ihave = 1; iterm = 0; while ( 1 ) lchar = lchar + 1; c = s(lchar+1); % % Blank character. % if ( c == ' ' ) if ( ihave == 2 ) elseif ( ihave == 6 || ihave == 7 ) iterm = 1; elseif ( 1 < ihave ) ihave = 11; end % % Comma. % elseif ( c == ',' || c == ';' ) if ( ihave ~= 1 ) iterm = 1; ihave = 12; lchar = lchar + 1; end % % Minus sign. % elseif ( c == '-' ) if ( ihave == 1 ); ihave = 2; isgn = -1; elseif ( ihave == 6 ) ihave = 7; jsgn = -1; else iterm = 1; end % % Plus sign. % elseif ( c == '+' ) if ( ihave == 1 ) ihave = 2; elseif ( ihave == 6 ) ihave = 7; else iterm = 1; end % % Decimal point. % elseif ( c == '.' ) if ( ihave < 4 ) ihave = 4; elseif ( 6 <= ihave && ihave <= 8 ) ihave = 9; else iterm = 1; end % % Exponent marker. % elseif ( ch_eqi ( c, 'E' ) || ch_eqi ( c, 'D' ) ) if ( ihave < 6 ) ihave = 6; else iterm = 1; end % % Digit. % elseif ( ihave < 11 && ch_is_digit ( c ) ) if ( ihave <= 2 ) ihave = 3; elseif ( ihave == 4 ) ihave = 5; elseif ( ihave == 6 || ihave == 7 ) ihave = 8; elseif ( ihave == 9 ) ihave = 10; end d = ch_to_digit ( c ); if ( ihave == 3 ) rtop = 10.0 * rtop + d; elseif ( ihave == 5 ) rtop = 10.0 * rtop + d; rbot = 10.0 * rbot; elseif ( ihave == 8 ) jtop = 10 * jtop + d; elseif ( ihave == 10 ) jtop = 10 * jtop + d; jbot = 10 * jbot; end % % Anything else is regarded as a terminator. % else iterm = 1; end % % If we haven't seen a terminator, and we haven't examined the % entire string, go get the next character. % if ( iterm == 1 || s_length <= lchar + 1 ) break; end end % % If we haven't seen a terminator, and we have examined the % entire string, then we're done, and LCHAR is equal to S_LENGTH. % if ( iterm ~= 1 && lchar + 1 == s_length ) lchar = s_length; end % % Number seems to have terminated. Have we got a legal number? % Not if we terminated in states 1, 2, 6 or 7! % if ( ihave == 1 || ihave == 2 || ihave == 6 || ihave == 7 ) fprintf ( 1, ' ' ); fprintf ( 1, 'S_TO_R8 - Fatal error! ' ); fprintf ( 1, ' IHAVE = %d ', ihave ); error ( 'S_TO_R8 - Fatal error!' ); end % % Number seems OK. Form it. % if ( jtop == 0 ) rexp = 1.0; else if ( jbot == 1 ) rexp = 10.0^( jsgn * jtop ); else rexp = jsgn * jtop; rexp = rexp / jbot; rexp = 10.0^rexp; end end r = isgn * rexp * rtop / rbot; return end function [ word, done ] = word_next_read ( s, done ) %*****************************************************************************80 % %% WORD_NEXT_READ "reads" words from a string, one at a time. % % Special cases: % % The following characters are considered to be a single word, % whether surrounded by spaces or not: % % " ( ) { } [ ] % % Also, if there is a trailing comma on the word, it is stripped off. % This is to facilitate the reading of lists. % % Licensing: % % This code is distributed under the GNU LGPL license. % % Parameters: % % Input, string S, a string, presumably containing words % separated by spaces. % % Input, logical DONE. % TRUE, if we are beginning a new string; % FALSE, if we are continuing to process the current string. % % Output, string WORD. % If DONE is FALSE, then WORD contains the "next" word read. % If DONE is TRUE, then WORD is blank, because there was no more to read. % % Output, logical DONE. % FALSE if another word was read, % TRUE if no more words could be read. % persistent lenc; persistent next; tab = char ( 9 ); % % We "remember" LENC and NEXT from the previous call. % % An input value of DONE = TRUE signals a new line of text to examine. % if ( done ) next = 1; done = 0; lenc = s_len_trim ( s ); if ( lenc <= 0 ) done = 1; word = ' '; return end end % % Beginning at index NEXT, search the string for the next nonblank, % which signals the beginning of a word. % ilo = next; % % ...S(NEXT:) is blank. Return with WORD = ' ' and DONE = TRUE. % while ( 1 ) if ( lenc < ilo ) word = ' '; done = 1; next = lenc + 1; return end % % If the current character is blank, skip to the next one. % if ( s(ilo) ~= ' ' && s(ilo) ~= tab ) break end ilo = ilo + 1; end % % ILO is the index of the next nonblank character in the string. % % If this initial nonblank is a special character, % then that's the whole word as far as we're concerned, % so return immediately. % if ( s(ilo) == '"' || ... s(ilo) == '(' || ... s(ilo) == ')' || ... s(ilo) == '{' || ... s(ilo) == '}' || ... s(ilo) == '[' || ... s(ilo) == ']' ) word = s(ilo); next = ilo + 1; return end % % Now search for the last contiguous character that is not a % blank, TAB, or special character. % next = ilo + 1; while ( next <= lenc ) if ( s(next) == ' ' ) break; elseif ( s(next) == tab ) break; elseif ( s(next) == '"' ) break; elseif ( s(next) == '(' ) break; elseif ( s(next) == ')' ) break; elseif ( s(next) == '{' ) break; elseif ( s(next) == '}' ) break; elseif ( s(next) == '[' ) break; elseif ( s(next) == ']' ) break; end next = next + 1; end if ( s(next-1) == ',' ) word = s(ilo:next-2); else word = s(ilo:next-1); end return end
然后可视化:
[vertices, faces ]= obj__read( 'aman_per_chair_d_true.obj' ); % trimesh(faces', vertices(1,:), vertices(2,:), vertices(3,:),'LineWidth',1,'EdgeColor','k'); % axis off; mesh = trisurf(faces', vertices(1,:), vertices(2,:), vertices(3,:)'), axis image, shading interp, colorbar; colormap(hot); axis off; grid off; title('mesh'); zdir=[1 1 1]; rotate(mesh,zdir,10);
备注,这里可以调节渐变色的范围(编辑-颜色图)