public Vector3F GetSunlight()
{
if (SunDirection.Y >= 0)
{
//----- Sun is above horizon.
return(GetTransmittance(SunDirection) * SunIntensity);
}
//----- Sun is below horizon.
// Get angle.
float sunAngle = (float)MathHelper.ToDegrees(Math.Asin(SunDirection.Y));
if (sunAngle < -5)
{
return(Vector3F.Zero);
}
// Sample horizon instead of real direction.
Vector3F direction = SunDirection;
direction.Y = 0;
if (!direction.TryNormalize())
{
return(Vector3F.Zero);
}
Vector3F horizonSunlight = GetTransmittance(direction) * SunIntensity;
// Lerp horizon sunlight to 0 at -5°.
float f = 1 - MathHelper.Clamp(-sunAngle / 5.0f, 0, 1);
return(horizonSunlight * f);
}
private void CreateGuiControls()
{
var panel = SampleFramework.AddOptions("Shadows");
// ----- Light node controls
var lightNodePanel = SampleHelper.AddGroupBox(panel, "Light Nodes");
SampleHelper.AddDropDown(
lightNodePanel,
"Light type",
new[] { "Spotlight", "PointLight" },
0,
selectedItem =>
{
bool enableSpotlight = (selectedItem == "Spotlight");
_spotlightNode.IsEnabled = enableSpotlight;
_pointLightNode.IsEnabled = !enableSpotlight;
});
SampleHelper.AddSlider(
lightNodePanel,
"Range",
"F2",
1,
30,
10,
value =>
{
_spotlight.Range = value;
_pointLight.Range = value;
});
SampleHelper.AddSlider(
lightNodePanel,
"Y position",
"F2",
0,
10,
1,
value =>
{
foreach (var node in new[] { _spotlightNode, _pointLightNode })
{
var pose = node.PoseWorld;
pose.Position.Y = value;
node.PoseWorld = pose;
}
});
SampleHelper.AddSlider(
lightNodePanel,
"X rotation",
"F0",
-90,
90,
1,
value =>
{
var pose = _spotlightNode.PoseWorld;
pose.Orientation = Matrix33F.CreateRotationX(MathHelper.ToRadians(value));
_spotlightNode.PoseWorld = pose;
});
SampleHelper.AddSlider(
lightNodePanel,
"Spotlight angle",
"F2",
1,
89,
MathHelper.ToDegrees(_spotlight.CutoffAngle),
value =>
{
float angle = MathHelper.ToRadians(value);
_spotlight.FalloffAngle = 0.8f * angle;
_spotlight.CutoffAngle = angle;
});
// ----- Shadow controls
var shadowPanel = SampleHelper.AddGroupBox(panel, "Shadow");
SampleHelper.AddSlider(
shadowPanel,
"Shadow map resolution",
"F0",
16,
1024,
_standardShadow.PreferredSize,
value =>
{
_standardShadow.PreferredSize = (int)value;
_cubeMapShadow.PreferredSize = (int)value;
});
SampleHelper.AddCheckBox(
shadowPanel,
"Prefer 16 bit",
_standardShadow.Prefer16Bit,
isChecked =>
{
_standardShadow.Prefer16Bit = isChecked;
_cubeMapShadow.Prefer16Bit = isChecked;
});
SampleHelper.AddSlider(
shadowPanel,
"Depth bias",
"F2",
0,
10,
_standardShadow.DepthBias,
value =>
{
_standardShadow.DepthBias = value;
_cubeMapShadow.DepthBias = value;
});
SampleHelper.AddSlider(
shadowPanel,
"Normal offset",
"F2",
0,
10,
_standardShadow.NormalOffset,
value =>
{
_standardShadow.NormalOffset = value;
_cubeMapShadow.NormalOffset = value;
});
SampleHelper.AddSlider(
shadowPanel,
"Number of samples",
"F0",
-1,
32,
_standardShadow.NumberOfSamples,
value =>
{
_standardShadow.NumberOfSamples = (int)value;
_cubeMapShadow.NumberOfSamples = (int)value;
});
SampleHelper.AddSlider(
shadowPanel,
"Filter radius",
"F2",
0,
10,
_standardShadow.FilterRadius,
value =>
{
_standardShadow.FilterRadius = value;
_cubeMapShadow.FilterRadius = value;
});
SampleHelper.AddSlider(
shadowPanel,
"Jitter resolution",
"F0",
1,
10000,
_standardShadow.JitterResolution,
value =>
{
_standardShadow.JitterResolution = value;
_cubeMapShadow.JitterResolution = value;
});
SampleFramework.ShowOptionsWindow("Shadows");
}