private static void RenderShadowShader(this Image <Rgba32> screen, float[,] zBuffer)
{
var shadowBuffer = new float[ScreenWidth, ScreenHeight];
var cameraPosition = new Vector3(1, 1, 3);
var cameraTarget = new Vector3(0, 0, 0);
var cameraUp = new Vector3(0, 1, 0);
var viewPort = CreateViewPort(ScreenWidth / 8, ScreenHeight / 8, ScreenWidth * 3 / 4, ScreenHeight * 3 / 4);
var projection = CreateProjection(-1 / (cameraPosition - cameraTarget).Length());
var modelView = CreateLookAt(cameraPosition, cameraTarget, cameraUp);
var light = new Vector3(1, 1, 1);
light = (projection * modelView).Multiply(light).Normalize();
var shadowProjection = Matrix4x4.Identity;
var shadowModelView = CreateLookAt(light, cameraTarget, cameraUp);
var model = ModelUtils.LoadModel(@"Resources\Diablo3\Model.obj");
var texture = TextureUtils.LoadTexture(@"Resources\Diablo3\Diffuse.png");
var normalMap = TextureUtils.LoadTexture(@"Resources\Diablo3\Normal.png");
var specularMap = TextureUtils.LoadTexture(@"Resources\Diablo3\Specular.png");
specularMap.Mutate(context => context.Flip(FlipType.Vertical));
IShader shader = new ZBufferShader
{
Transform = viewPort * shadowProjection * shadowModelView
};
screen.Render(model, shader, shadowBuffer);
shader = new ShadowShader
{
Transform = viewPort * projection * modelView,
MIT = (projection * modelView).Invert().Transpose(),
ShadowTransform = viewPort * shadowProjection * shadowModelView *
(viewPort * projection * modelView).Invert(),
Light = light,
Texture = texture,
NormalMap = normalMap,
SpecularMap = specularMap,
ShadowBuffer = shadowBuffer
};
screen.Mutate(context => context.Fill(Rgba32.Black));
screen.Render(model, shader, zBuffer);
}
private static void RenderAmbientOccolusion(this Image <Rgba32> screen, float[,] zBuffer)
{
var cameraPosition = new Vector3(1, 1, 3);
var cameraTarget = new Vector3(0, 0, 0);
var cameraUp = new Vector3(0, 1, 0);
var viewPort = CreateViewPort(ScreenWidth / 8, ScreenHeight / 8, ScreenWidth * 3 / 4, ScreenHeight * 3 / 4);
var projection = CreateProjection(-1 / (cameraPosition - cameraTarget).Length());
var modelView = CreateLookAt(cameraPosition, cameraTarget, cameraUp);
IShader shader = new ZBufferShader
{
Transform = viewPort * projection * modelView
};
var model = ModelUtils.LoadModel(@"Resources\Diablo3\Model.obj");
screen.Render(model, shader, zBuffer);
screen.RenderAmbientOccolusion(zBuffer, ScreenWidth, ScreenHeight);
}
public static Image <Rgba32> GenerateOccolusionMap(this IReadOnlyCollection <TriangleInfo> model,
Matrix4x4 viewPort, int imageWidth,
int imageHeight, int passNumber)
{
var screen = new Image <Rgba32>(imageWidth, imageHeight);
screen.Mutate(context => context.Fill(Rgba32.Black));
var resultOcclusionMap = new Image <Rgba32>(imageWidth, imageHeight);
resultOcclusionMap.Mutate(context => context.Fill(Rgba32.Black));
var passOcclusionMap = new Image <Rgba32>(imageWidth, imageHeight);
passOcclusionMap.Mutate(context => context.Fill(Rgba32.Black));
var occlusionBuffer = new float[imageWidth, imageHeight];
var zBuffer = new float[imageWidth, imageHeight];
var zBufferShader = new ZBufferShader();
var occlusionShader = new OcclusionShader
{
PassOcclusionMap = passOcclusionMap,
OcclusionBuffer = occlusionBuffer
};
var cameraTarget = new Vector3(0, 0, 0);
for (var pass = 1; pass <= passNumber; pass++)
{
Array.Clear(occlusionBuffer, 0, imageWidth * imageHeight);
Array.Clear(zBuffer, 0, imageWidth * imageHeight);
passOcclusionMap.Mutate(context => context.Fill(Rgba32.Black));
var cameraPosition = MathUtils.RandomOnUnitSphere();
cameraPosition.Y = Math.Abs(cameraPosition.Y);
var cameraUp = MathUtils.RandomUnitVector3();
var modelView = MathUtils.CreateLookAt(cameraPosition, cameraTarget, cameraUp);
var transform = viewPort * modelView;
zBufferShader.Transform = transform;
screen.Render(model, zBufferShader, occlusionBuffer);
occlusionShader.Transform = transform;
screen.Render(model, occlusionShader, zBuffer);
for (var i = 0; i < imageWidth; i++)
{
for (var j = 0; j < imageHeight; j++)
{
var previous = resultOcclusionMap[i, j].R;
var current = passOcclusionMap[i, j].R;
var color = (byte)((float)(previous * (pass - 1) + current) / pass + .5f);
resultOcclusionMap[i, j] = new Rgba32(color, color, color);
}
}
}
return(resultOcclusionMap);
}
