Method SetupDynamicDirectionalLightView

src/render/PlanarShadowMap.cpp:113–150

}

bool PlanarShadowMap::SetupDynamicDirectionalLightView(const DirectionalLight& light, float3 anchor, float3 halfShadowBoxSize, float3 preViewTranslation, float fadeRangeWorld)
{
    daffine3 viewToWorld = light.GetNode()->GetLocalToWorldTransform();
    // Zero the translation component to ignore where the actual light scene node is located, we only care about direction
    viewToWorld.m_translation = dm::double3(0.0);
    viewToWorld = dm::scaling(dm::double3(1.0, 1.0, -1.0)) * viewToWorld;
    affine3 worldToView = affine3(inverse(viewToWorld));

    // Snap the anchor to the texel grid to avoid jitter
    float2 texelSize = float2(2.f) * halfShadowBoxSize.xy() / m_ShadowMapSize;

    float3 anchorView = worldToView.transformPoint(anchor - preViewTranslation);
    anchorView.xy() = float2(round(anchorView.xy() / texelSize)) * texelSize; // why doesn't it compile without float2(...) ?
    float3 center = float3(viewToWorld.transformPoint(double3(anchorView))) + preViewTranslation;

    // Make sure we didn't move the anchor too far
    assert(length(center - anchor) < max(texelSize.x, texelSize.y) * 2);

    worldToView = translation(-center) * worldToView;

    // Build the projection matrix
    float4x4 projection = orthoProjD3DStyle(
        -halfShadowBoxSize.x, halfShadowBoxSize.x, 
        -halfShadowBoxSize.y, halfShadowBoxSize.y, 
        -halfShadowBoxSize.z, halfShadowBoxSize.z);

    bool viewIsModified = m_View->GetViewMatrix() != worldToView || any(m_View->GetProjectionMatrix(false) != projection);

    m_View->SetMatrices(worldToView, projection);
    m_View->UpdateCache();

    m_FadeRangeTexels = clamp(
        float2(fadeRangeWorld * m_ShadowMapSize) / (halfShadowBoxSize.xy() * 2.f),
        float2(1.f),
        m_ShadowMapSize * 0.5f);

    return viewIsModified;
}

void PlanarShadowMap::SetupProxyView()
{