Vector4 LightInfo::GetPointLightOnPoint(const Vector4& _cameraSpacePoint, const Vector4& _point, const Vector4& _normal, int _lightIndex, const Vector4& _diffuse, const Vector4& _specular) {
// Get the difference in position from the light and the point.
Vector4 diff = GetPointLights()[_lightIndex].GetPosition() - _point;
Vector4 lightDirection = diff;
// The distance
float distance = diff.Length();
// The direction
diff.Normalize();
// The attenuation
float attenuation = GetPointLights()[_lightIndex].GetAttenuation(distance);
// Diffuse lighting.
Vector4 pointColor = GetPointLights()[_lightIndex].GetIntensity()
* diff.Dot(_normal)
* attenuation
* _diffuse;
pointColor.Clamp();
// Specular
// We get the half angle between the camera and the direction to the camera.
Vector4 halfAngle = lightDirection + _cameraSpacePoint;
halfAngle.Normalize();
Vector4 specular = _specular * powf(halfAngle.Dot(_normal), 10) * attenuation;
specular.Clamp();
pointColor += specular;
return pointColor;
}
Vector3 ComputePoint(float32_t param, const Vector3& a, const Vector3& b, const Vector3& c, const Vector3& d, const CurveGenerator::Type type )
{
Vector4 v = ComputeParam( param, type );
const Matrix4& curveBasis = ComputeBasis( type );
Vector4 x (a.x, b.x, c.x, d.x);
x = curveBasis * x;
Vector4 y (a.y, b.y, c.y, d.y);
y = curveBasis * y;
Vector4 z (a.z, b.z, c.z, d.z);
z = curveBasis * z;
return Vector3 (v.Dot(x), v.Dot(y), v.Dot(z));
}
/* Get the light value for a point in space */
Vector4 LightInfo::GetDirectionalLightOnPoint(const Vector4& _cameraSpacePoint, const Vector4& _normal, int _lightIndex, const Vector4& _diffuse, const Vector4& _specular) {
Vector4 directionalColor = GetDirectionalLights()[_lightIndex].GetIntensity() * GetDirectionalLights()[_lightIndex].GetDirection().Dot(_normal) * _diffuse;
directionalColor.Clamp();
// Specular
Vector4 halfAngle = GetDirectionalLights()[_lightIndex].GetDirection() + _cameraSpacePoint;
halfAngle.Normalize();
Vector4 specular = _specular * powf(halfAngle.Dot(_normal), 100) * GetDirectionalLights()[_lightIndex].GetIntensity();
specular.Clamp();
directionalColor += specular;
return directionalColor;
}
// Get the spot light info on a point.
Vector4 LightInfo::GetSpotLightOnPoint(const Vector4& _cameraSpacePoint, const Vector4& _point, const Vector4& _normal, int _lightIndex, const Vector4& _diffuse, const Vector4& _specular) {
// Get the difference in position from the light and the point.
Vector4 diff = GetSpotLights()[_lightIndex].GetPosition() - _point;
Vector4 lightDirection = diff;
// The distance
float distance = diff.Length();
// The direction
diff.Normalize();
// Calculate the spot light values
float spotLightValue = diff.Dot(GetSpotLights()[_lightIndex].GetDirection() * -1);
if (spotLightValue > 0.2f)
return Vector4(0, 0, 0, 0);
float smoothing = GetSpotLights()[_lightIndex].SmoothStep(diff.Dot(_normal));
// The attenuation
float attenuation = GetSpotLights()[_lightIndex].GetAttenuation(distance);
// Diffuse lighting.
Vector4 pointColor = GetSpotLights()[_lightIndex].GetIntensity()
* diff.Dot(_normal)
* attenuation
* _diffuse
* spotLightValue;
// Specular
// We get the half angle between the camera and the direction to the camera.
Vector4 halfAngle = lightDirection + _cameraSpacePoint;
halfAngle.Normalize();
pointColor += _specular * powf(halfAngle.Dot(_normal), 10) * attenuation;
return pointColor;
}
