/// <summary>
/// Recreates render textures if their resolution differs from the set resolution.
/// </summary>
private void UpdateRenderTextureResolution()
{
if (m_RenderTexture1 != null && m_RenderTexture1.width != m_RenderTextureResolution)
{
RenderTextureUtil.RecreateRenderTexture(ref m_RenderTexture1, m_RenderTextureResolution);
RenderTextureUtil.RecreateRenderTexture(ref m_RenderTexture2, m_RenderTextureResolution);
}
}
private void Start()
{
// Create Shader IDs.
m_LayerTextureID = Shader.PropertyToID("_LayerTex");
m_LayerTextureTransformID = Shader.PropertyToID("_LayerTex_ST");
m_LayerParamsID = Shader.PropertyToID("_LayerParams");
m_LayerOpacityID = Shader.PropertyToID("_LayerOpacity");
// Create render texture.
m_RenderTexture1 = RenderTextureUtil.CreateRenderTexture(m_RenderTextureResolution);
m_RenderTexture2 = RenderTextureUtil.CreateRenderTexture(m_RenderTextureResolution);
// Create materials.
m_CloudShadowMaterial = ResourceUtil.CreateMaterial(SHADER_PATH_CLOUD_SHADOWS);
// Initial Update
UpdateLightProperties();
}
/// <summary>
/// Renders all of the layers to a single render texture and assigns it to the light.
/// </summary>
private void RenderCloudShadows()
{
// Clear alpha channel of first render texture to white.
RenderTextureUtil.ClearRenderTexture(m_RenderTexture1, new Color(0, 0, 0, 1));
// Don't render if Cloud Layers are not assigned or opacity is 0
if (m_CloudLayers != null && m_OpacityMultiplier > 0.0f)
{
// Calculate the angle between the lights direction and the horizon.
float angleToHorizon = Vector3.Angle(Vector3.up, transform.forward) - 90;
// Render layers
for (int i = 0; i < m_CloudLayers.LayerCount; ++i)
{
CloudLayerData cloudLayerData = m_CloudLayers[i];
// Update cloud layer animation offsets.
UpdateCloudLayerDataAnimationOffset(cloudLayerData, m_WorldSize, m_SpeedMultiplier, m_DirectionModifier);
if (cloudLayerData.IsVisible)
{
// Set material texture properties.
m_CloudShadowMaterial.SetTexture(m_LayerTextureID, cloudLayerData.Texture);
m_CloudShadowMaterial.SetVector(m_LayerTextureTransformID, cloudLayerData.TextureTransform);
// Set remaining material properties.
m_CloudShadowMaterial.SetVector(m_LayerParamsID, ExtractCloudLayerParameters(cloudLayerData));
m_CloudShadowMaterial.SetFloat(m_LayerOpacityID, CalculateCloudLayerOpacity(cloudLayerData, angleToHorizon));
// Blit using material.
Graphics.Blit(m_RenderTexture1, m_RenderTexture2, m_CloudShadowMaterial, (int)cloudLayerData.BlendMode);
// Swap render texture references.
RenderTextureUtil.SwapRenderTextures(ref m_RenderTexture1, ref m_RenderTexture2);
}
}
}
UpdateLightProperties();
}
