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73 lines
2.6 KiB
73 lines
2.6 KiB
using UnityEngine;
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using System.Collections;
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public class PlanetInit : MonoBehaviour
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{
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public GameObject m_sun;
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public Material m_groundMaterial;
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public Material m_skyMaterial;
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public float m_hdrExposure = 0.8f;
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public Vector3 m_waveLength = new Vector3(0.65f,0.57f,0.475f); // Wave length of sun light
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public float m_ESun = 20.0f; // Sun brightness constant
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public float m_kr = 0.0025f; // Rayleigh scattering constant
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public float m_km = 0.0010f; // Mie scattering constant
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public float m_g = -0.990f; // The Mie phase asymmetry factor, must be between 0.999 to -0.999
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//Dont change these
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private const float m_outerScaleFactor = 1.025f; // Difference between inner and ounter radius. Must be 2.5%
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private float m_innerRadius; // Radius of the ground sphere
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private float m_outerRadius; // Radius of the sky sphere
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private float m_scaleDepth = 0.25f; // The scale depth (i.e. the altitude at which the atmosphere's average density is found)
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void Start ()
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{
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//Get the radius of the sphere. This presumes that the sphere mesh is a unit sphere (radius of 1)
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//that has been scaled uniformly on the x, y and z axis
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float radius = transform.lossyScale.x;
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m_innerRadius = radius;
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//The outer sphere must be 2.5% larger that the inner sphere
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m_outerRadius = m_outerScaleFactor * radius;
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InitMaterial(m_groundMaterial);
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InitMaterial(m_skyMaterial);
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}
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void Update ()
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{
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InitMaterial(m_groundMaterial);
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InitMaterial(m_skyMaterial);
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}
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void InitMaterial(Material mat)
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{
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Vector3 invWaveLength4 = new Vector3(1.0f / Mathf.Pow(m_waveLength.x, 4.0f), 1.0f / Mathf.Pow(m_waveLength.y, 4.0f), 1.0f / Mathf.Pow(m_waveLength.z, 4.0f));
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float scale = 1.0f / (m_outerRadius - m_innerRadius);
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mat.SetVector("v3LightPos", m_sun.transform.forward*-1.0f);
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mat.SetVector("v3InvWavelength", invWaveLength4);
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mat.SetFloat("fOuterRadius", m_outerRadius);
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mat.SetFloat("fOuterRadius2", m_outerRadius*m_outerRadius);
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mat.SetFloat("fInnerRadius", m_innerRadius);
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mat.SetFloat("fInnerRadius2", m_innerRadius*m_innerRadius);
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mat.SetFloat("fKrESun", m_kr*m_ESun);
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mat.SetFloat("fKmESun", m_km*m_ESun);
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mat.SetFloat("fKr4PI", m_kr*4.0f*Mathf.PI);
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mat.SetFloat("fKm4PI", m_km*4.0f*Mathf.PI);
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mat.SetFloat("fScale", scale);
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mat.SetFloat("fScaleDepth", m_scaleDepth);
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mat.SetFloat("fScaleOverScaleDepth", scale/m_scaleDepth);
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mat.SetFloat("fHdrExposure", m_hdrExposure);
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mat.SetFloat("g", m_g);
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mat.SetFloat("g2", m_g*m_g);
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mat.SetVector("v3LightPos", m_sun.transform.forward*-1.0f);
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mat.SetVector("v3Translate", transform.position);
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}
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}
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