[Solved] Computer Graphics- Lab Assignment 5

Computer Graphics, Lab Assignment 5

+ LabAssignment2/

+ 1/

• py

+ 2/

• py

+ 3/

• py

• The submission time is determined not when the commit is made but when the git push is made.

1. Write down a Python program to draw a transformed triangle and its local frame in a 3D space. A. Set the window title to your student ID and the window size to (480,480).
   1. Use the following drawFrame() and drawTriangle() to draw the frame and triangle:

1. First draw an untransformed white triangle and a global frame.
2. Then draw a transformed blue triangle and its local frame. The triangle should be first rotated by 30 degrees and then translated by (0.6, 0, 0) w.r.t. the global frame. E. Expected result:
4. Files to submit: A Python source file (Name the file whatever you want (in English). Extension should be .py)

2. Write down a Python program to draw a transformed triangle in a 3D space.
   1. Set the window title to your student ID and the window size to (480,480).
   2. Use the following code snippet:

gCamAng = 0

gComposedM = np.identity(4)

def render(M, camAng):

# enable depth test (well see details later) glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT) glEnable(GL_DEPTH_TEST)

glLoadIdentity()

# use orthogonal projection (well see details later) glOrtho(-1,1, 1,1, 1,1)

# rotate camera position to see this 3D space better (well see details later)

gluLookAt(.1*np.sin(camAng),.1, .1*np.cos(camAng), 0,0,0, 0,1,0)

# draw coordinate: x in red, y in green, z in blue glBegin(GL_LINES) glColor3ub(255, 0, 0) glVertex3fv(np.array([0.,0.,0.])) glVertex3fv(np.array([1.,0.,0.])) glColor3ub(0, 255, 0) glVertex3fv(np.array([0.,0.,0.])) glVertex3fv(np.array([0.,1.,0.])) glColor3ub(0, 0, 255) glVertex3fv(np.array([0.,0.,0])) glVertex3fv(np.array([0.,0.,1.])) glEnd()

# draw triangle glBegin(GL_TRIANGLES) glColor3ub(255, 255, 255) glVertex3fv((M @ np.array([.0,.5,0.,1.]))[:-1]) glVertex3fv((M @ np.array([.0,.0,0.,1.]))[:-1]) glVertex3fv((M @ np.array([.5,.0,0.,1.]))[:-1]) glEnd()

def key_callback(window, key, scancode, action, mods):

global gCamAng, gComposedM if action==glfw.PRESS or action==glfw.REPEAT:

if key==glfw.KEY_1:

gCamAng += np.radians(-10) elif key==glfw.KEY_3: gCamAng += np.radians(10)

1. If you press or repeat a key, the triangle should be transformed as shown in the Table.

Note that key 1 and 3 are already implemented in the above code snippet.

1. Transformations should be accumulated (composed with previous one).
2. Youll need two global variables to store current accumulated transformation and current camera angle.
3. Files to submit: A Python source file (Name the file whatever you want (in English). Extension should be .py)