Perspective Projection

[Ruby The Roobster]

I again am having issues with OpenGL, this time with the 
projection matrix.  Using gl3n, I have the following code:

```d
     // model matrix
     mat4 trans = mat4(0f);
     trans.make_identity();
     trans = trans.rotatex(radians(-55));

     // view matrix:
     mat4 view = mat4(0f);
     view.make_identity();
     view = view.translation(0f ,0f, -3f);

     // projection matrix
     mat4 projection;
     projection.make_identity();
     projection = projection.perspective(800f, 600f, radians(45f), 
.1f, 100f);
```

I am binding all of these matrices to the correct locations, and 
this seems to be the gl3n equivalent to what is given in the 
OpenGL tutorial:

```c
         // create transformations
         glm::mat4 model         = glm::mat4(1.0f); // make sure 
to initialize matrix to identity matrix first
         glm::mat4 view          = glm::mat4(1.0f);
         glm::mat4 projection    = glm::mat4(1.0f);
         model = glm::rotate(model, glm::radians(-55.0f), 
glm::vec3(1.0f, 0.0f, 0.0f));
         view  = glm::translate(view, glm::vec3(0.0f, 0.0f, 
-3.0f));
         projection = glm::perspective(glm::radians(45.0f), 800f / 
600f, 0.1f, 100.0f);
```

Everything displays fine (with orthographic projection, of 
course) if you leave the projection as the identity matrix, but 
setting it as I have done results in a blank screen.  I assume it 
has to do with the values of

`(projection * view * trans * vec4(vertex, 1)).w` not being 1.  
Should I just use a different library, and if so, how to use it 
to generate a perspective matrix?