public void Draw(camera3d cam, directionalLightSource light)
{
if (!visible)
{
return; // dont render hidden meshes
}
foreach (ModelMesh mesh in mesh.Meshes) // loop through the mesh in the 3d model, drawing each one in turn.
{
foreach (BasicEffect effect in mesh.Effects) // This loop then goes through every effect in each mesh.
{
effect.World = transforms[mesh.ParentBone.Index]; // begin dealing with transforms to render the object into the game world
// The following effects allow the object to be drawn in the correct place, with the correct rotation and scale.
///////////////////////////////////////////////////////////////////
//
// CODE FOR TASK 1 SHOULD BE ENTERED HERE
// -----------------------------------------------------------------
//
// To render we need three things - world matrix, view matrix and projection matrix
// But we actually start in model space - this is when our world starts before transforms
//--------------------------------------
// MESH BASE MATRIX
//--------------------------------------
// Our meshes start with world - model space, so we use our transforms array
effect.World = transforms[mesh.ParentBone.Index];
//--------------------------------------
// WORLD MATRIX
//--------------------------------------
// Transform from model space to world space in order - scale, rotation, translation.
// 1. Scale
//Scale our model by multiplying the world matrix by a scale matrix
//XNA does this for us using CreateScale()
effect.World *= Matrix.CreateScale(scale);
// 2. Rotation
// Rotate our model in the game world
effect.World *= Matrix.CreateRotationX(rotation.X); // Rotate the x axis
effect.World *= Matrix.CreateRotationY(rotation.Y); // Rotate the y axis
effect.World *= Matrix.CreateRotationZ(rotation.Z); // Rotate the z axis
// 3. Translation / Position
// Move our model to the correct place in the game world
effect.World *= Matrix.CreateTranslation(position);
//--------------------------------------
// VIEW MATRIX
//--------------------------------------
// This puts the model in relation to where our cam is, and direction of our cam.
effect.View = Matrix.CreateLookAt(cam.position, cam.target, cam.whichWayIsUp);
//--------------------------------------
// PROJECTION MATRIX
//--------------------------------------
// Projection changes from view space (3D) to screen space (2D)
// Can be either orthographic or perspective
// Perspective
effect.Projection = Matrix.CreatePerspectiveFieldOfView(cam.fieldOfView, cam.aspectRatio, cam.nearPlane, cam.farPlane);
//Orthographic
//effect.Projection = Matrix.CreateOrthographic(1600f, 900f, 1f, 10000f);
///////////////////////////////////////////////////////////////////
// the following effects are related to lighting and texture settings, feel free to tweak them to see what happens.
effect.LightingEnabled = true;
effect.Alpha = Alpha; // amount of transparency
effect.AmbientLightColor = new Vector3(0.25f); // fills in dark areas with a small amount of light
effect.DiffuseColor = new Vector3(0.1f);
// Diffuse is the standard colour method
effect.DirectionalLight0.Enabled = true; // allows a directional light
effect.DirectionalLight0.DiffuseColor = light.diffuseColor; // the directional light's main colour
effect.DirectionalLight0.SpecularColor = light.specularColor; // the directional light's colour used for highlights
effect.DirectionalLight0.Direction = light.direction; // the direction of the light
effect.EmissiveColor = new Vector3(0.15f);
}
mesh.Draw(); // draw the current mesh using the effects.
}
}
