Homework 5

Short Description:

This assignment is worth 50 points.

Goals

• Demonstrate your ability to load a surface and display a surface.
• Demonstrate your ability to load and use files in the class' off file format.
• Create normals at a point.
• Use the Pre 3.0 edition of the OpenGL lighting model.

Formal Description

Add the ability to load a terrain file. The terrain file format consists of two integers N and M, representing the size of a grid (N squares by M squares). This is followed by (N+1)*(M+1) height values. An example might be:

3 4
0    1    1.5  2 
1    1.5  2    2.5
1.5  2    2.5  3
2    2.5  3    3
2.5  3    3    3

This should be a sloped surface with a high plateau at one end.

In my world, this was generated by the function

const GLfloat  scale = sqrt(XDIM*XDIM+YDIM*YDIM)/24;

GLfloat  height(GLfloat  x, GLfloat  y) {
    GLfloat  d =sqrt(float(x)*x+y*y)/scale;
    return(cos(d)*SCALE_HEIGHT) ;
}

Your program should load these points and store them in a manner that can be used to draw a plane constructed from triangles. You should also compute normals for each point. These normals should be the average of the normals for all edges for which this point is an end point. You should store this information so that the surface can be drawn with glDrawElements.

You should implement the surface as an object.

Implement an object that will allow you load and display an off file as discussed earlier in the class.

For both of the above classes, think of the glWireTeapot command as a model. You will probably not want to draw multiple surfaces, but it might make sense to draw multiple instances of the data from an .off file. Again, your object should be drawn with a call to glMultiDrawElements.

Finally, implement lights in your world. You should have a minimum of two light sources, but you may have more. You need a "sun", which lights your world from above and a head mounted "flashlight", which is located at the eye position and travels with the camera.

Please use the following keypresses

Key	Action
Up Arrow	Move forward a single step along the current vector
Down Arrow	Move backward a single step along the current vector
Right Arrow	Turn to the right
Left Arrow	Turn to the left
A	Increase look ahead distance
a	Decrease look ahead distance
r	Reset to the default position
q	Exit the program
1	Toggle the sun on/off
2	Toggle the flashlight on/off

You may add other keypress operations as well, but please:

• Understand that I will add new required keypresses in the future, so you may need to remap your keys.
• Print a usage menu when your program starts showing all valid keypresses.

Discussion

Make sure that hidden surface removal and double buffering is enabled.

Submission