Chapter 8, Reviewing Our Knowledge of Triangles Video Solutions, Mathematics for Game Programming and Computer Graphics: Explore the essential mathematics for creating, rendering, and manipulating 3D virtual environments

Problem 1

Create a new folder in PyCharm called Chapter Eight and make copies for it of the final versions of the files from Chapter Seven. Then, include Button. py, Cube.py, Mesh3D. py, object.py, Settings . py, Transform.py, and Utils.py. Also, make a copy of AddingButtons. py from Chapter Seven for Chapter Eight but rename it DisplayTeapot.py.

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Problem 2

In the Chapter Eight folder, create a folder called models and copy the teapot.obj file from GitHub into it.

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Problem 3

Create a new Python script called LoadMesh.py and add the following code:
from Mesh3D import *
class LoadMesh(Mesh3D):
def __init__(self, draw_type, model_filename):
self.vertices, self.triangles =
self.load_drawing(model_filename)
self.draw_type = draw_type
def draw(self):
for t in range(0, len(self.triangles), 3):
glBegin(self.draw_type)
glVertex3fv(self.vertices[
self.triangles[t]])
glVertex3fv(self.vertices[
self.triangles[t + 1]])
glVertex3fv(self.vertices[
self.triangles[t + 2]])
glEnd()
glDisable(GL_TEXTURE_2D)

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Problem 4

To load this model into the project, open DisplayTeapot.py and make the following changes:
import math
import pygame.mouse
from Object import *
from Cube import *
from LoadMesh import *
from pygame.locals import *
...
objects_2d = []
cube = Object("Cube")
cube.add_component(Transform((0, 0, -5)))
cube.add_component(LoadMesh(GL_LINE_LOOP,
"models/teapot.obj"))
objects_3d.append(cube)

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