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Write a function stretch_model(fname_in, fname_out) that reads all the vertices and faces in the OBJ file specified by the string fname_in. The function should then transform the vertices to stretch the model by a factor of 2 along the y-axis, and then save the transformed vertices and faces to a file specified by the string fname_out. This function should return the total number of vertices that were stretched. If the specified file fname_in does not exist, stretch_model should instead return -1. To stretch the model along the y-axis, the y-coordinate for each vertex should be multiplied by 2. The x and z coordinates should not be affected. So, for the example given above, the output file would look like this (note that due to the OBJ model viewer automatically adjusting the boundaries, the image looks shortened rather than stretched): v -1.5 0.0 0.0 v 1.0 -4.0 0.0 v 0.0 3.0 0.0 f 1 2 3

Write a function stretch_model(fname_in, fname_out) that reads all the vertices and faces in the OBJ file specified by the string fname_in. The function should then transform the vertices to stretch the model by a factor of 2 along the y-axis, and then save the transformed vertices and faces to a file specified by the string fname_out. This function should return the total number of vertices that were stretched. If the specified file fname_in does not exist, stretch_model should instead return -1. To stretch the model along the y-axis, the y-coordinate for each vertex should be multiplied by 2. The x and z coordinates should not be affected. So, for the example given above, the output file would look like this (note that due to the OBJ model viewer automatically adjusting the boundaries, the image looks shortened rather than stretched): v -1.5 0.0 0.0 v 1.0 -4.0 0.0 v 0.0 3.0 0.0 f 1 2 3

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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You can use the example OBJ files in hw08files.zip on Canvas to test your function. Verify that your output looks correct using this online viewer: http://masc.cs.gmu.edu/wiki/ObjViewer. Hints: • You only need to alter the vertex lines (the ones starting with 'v'); the lines starting with 'f' can just be copied directly from the input file into the output file. • If you want to see text contents of an OBJ file rather than the 3D model, be sure to open the file with a text editor (like Atom) and not something like 3D Model Viewer. • You can convert a line from the OBJ file into a list with the statement listName = stringName.split(' '). • You can convert this list back into a string with the statement stringName= Constraints: Examples (assumes that missing.obj does not exist within your current directory): >>> stretch_model('missing.obj', 'doesntmatter.obj') -1 You may use any string or list method that is appropriate to solving this problem. • All files must be properly opened and closed. >>> stretch_model('triforce.obj', 9 '.join(listName). 'triforce_stretched.obj') >>> stretch_model('teapot.obj', 'tall_teapot.obj') 3644 Example Screenshots: (using http://masc.cs.gmu.edu/wiki/ObjViewer) triforce.obj triforce_stretched.obj teapot
Transcribed Image Text:You can use the example OBJ files in hw08files.zip on Canvas to test your function. Verify that your output looks correct using this online viewer: http://masc.cs.gmu.edu/wiki/ObjViewer. Hints: • You only need to alter the vertex lines (the ones starting with 'v'); the lines starting with 'f' can just be copied directly from the input file into the output file. • If you want to see text contents of an OBJ file rather than the 3D model, be sure to open the file with a text editor (like Atom) and not something like 3D Model Viewer. • You can convert a line from the OBJ file into a list with the statement listName = stringName.split(' '). • You can convert this list back into a string with the statement stringName= Constraints: Examples (assumes that missing.obj does not exist within your current directory): >>> stretch_model('missing.obj', 'doesntmatter.obj') -1 You may use any string or list method that is appropriate to solving this problem. • All files must be properly opened and closed. >>> stretch_model('triforce.obj', 9 '.join(listName). 'triforce_stretched.obj') >>> stretch_model('teapot.obj', 'tall_teapot.obj') 3644 Example Screenshots: (using http://masc.cs.gmu.edu/wiki/ObjViewer) triforce.obj triforce_stretched.obj teapot
Write a function stretch_model(fname_in, fname_out) that reads all the vertices and faces in the OBJ file specified by the string fname_in. The function should then transform the vertices to stretch the model by a factor of 2 along the y-axis, and then save the transformed vertices and faces to a file specified by the string fname_out. This function should return the total number of vertices that were stretched. If the specified file fname_in does not exist, stretch_model should instead return -1. To stretch the model along the y-axis, the y-coordinate for each vertex should be multiplied by 2. The x and z coordinates should not be affected. So, for the example given above, the output file would look like this (note that due to the OBJ model viewer automatically adjusting the boundaries, the image looks shortened rather than stretched): v -1.5 0.0 0.0 v 1.0 -4.0 0.0 v 0.0 3.0 0.0 f 1 2 3
Transcribed Image Text:Write a function stretch_model(fname_in, fname_out) that reads all the vertices and faces in the OBJ file specified by the string fname_in. The function should then transform the vertices to stretch the model by a factor of 2 along the y-axis, and then save the transformed vertices and faces to a file specified by the string fname_out. This function should return the total number of vertices that were stretched. If the specified file fname_in does not exist, stretch_model should instead return -1. To stretch the model along the y-axis, the y-coordinate for each vertex should be multiplied by 2. The x and z coordinates should not be affected. So, for the example given above, the output file would look like this (note that due to the OBJ model viewer automatically adjusting the boundaries, the image looks shortened rather than stretched): v -1.5 0.0 0.0 v 1.0 -4.0 0.0 v 0.0 3.0 0.0 f 1 2 3
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