Exemple #1
0
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;
}
Exemple #2
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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));
}
Exemple #3
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/* 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;
}
Exemple #4
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// 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;	
}