public void Render(SceneObject sObject, Float3 viewDirection, Float3 lightDirection, bool useProjection = true)
{
Mesh mesh = sObject.mesh;
Color wireFrameColor = Color.LightGreen;
RenderType renderType = sObject.material.renderType;
// Vertex uniforms
// scale matrix
Float3x3 S = Float3x3.identity * sObject.uniformScale;
// rotation matrix
Float3x3 R = Float3x3.getRotationMatrix(sObject.rotation);
Float3x3 CombinedLinear = S * R;
// translation
Float4x4 Tr = Float4x4.identity;
Tr.setTranslation(sObject.localPosition);
// projection
Float4x4 Pr = useProjection ? Float4x4.getProjectionMatrix(10f, 1300f, 1f, 1f) : Float4x4.identity;
// BACK FACE CULLING
if (backFaceCulling)
{
for (int i = mesh.Triangles.Count - 1; i >= 0; i--)
{
Triangle t = mesh.Triangles[i];
Float3 v1 = mesh.Vertices[t[0] - 1].position;
Float3 v2 = mesh.Vertices[t[1] - 1].position;
Float3 v3 = mesh.Vertices[t[2] - 1].position;
Float3 normal = Utils.getTriangleNormalR(v1, v2, v3);
// remove faced back triangles
if (viewDirection.dot(normal) >= 0)
mesh.Triangles.Remove(t);
}
}
// VERTEX SHADER
for (int i = 0; i < mesh.Vertices.Count; i++)
{
Vertex v = mesh.Vertices[i];
// scale
var p = v.position.mul(S);
// rotate
p = p.mul(R);
// translate
p = Tr.transformPoint(p);
// project
if(useProjection)
p = Pr.transformPoint(p);
// TODO: Transforming normals while NON UNIFORM TRANSFORMS
v.normal = v.normal.mul(R);
// TODO: place to center of screen
if(useProjection)
v.position = new Float3(p.x * Defaults.WIDTH + Defaults.WIDTH / 2f, p.y * Defaults.HEIGHT + Defaults.HEIGHT / 2f, p.z);
else
v.position = new Float3(p.x + Defaults.WIDTH / 2f, p.y + Defaults.HEIGHT / 2f, p.z);
}
if((renderType & RenderType.Regular) != 0)
RenderRegular(mesh, sObject.material, lightDirection);
if ((renderType & RenderType.Wireframe) != 0)
RenderWireframe(mesh, wireFrameColor);
if ((renderType & RenderType.Normals) != 0)
DrawVertexNormals(mesh, Color.Red);
}
private float getLamberComponent(Float3 normal, Float3 lightDirection)
{
normal = normal.normalize();
lightDirection = lightDirection.normalize();
float lambertComponent = normal.dot(lightDirection.normalize());
lambertComponent = lambertComponent < 0 ? 0 : lambertComponent;
return Utils.Clamp(0, 255, lambertComponent);
}