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Improve shadow stability and reduce foliage pop-in

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Kelsi 2026-02-04 16:30:24 -08:00
parent 979c0b5592
commit ab4cb878ea
6 changed files with 48 additions and 16 deletions
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26
src/rendering/renderer.cpp
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@ -1607,6 +1607,11 @@ uint32_t Renderer::compileShadowShader() {
}
glm::mat4 Renderer::computeLightSpaceMatrix() {
constexpr float kShadowHalfExtent = 180.0f;
constexpr float kShadowLightDistance = 280.0f;
constexpr float kShadowNearPlane = 1.0f;
constexpr float kShadowFarPlane = 600.0f;
// Sun direction matching WMO light dir
glm::vec3 sunDir = glm::normalize(glm::vec3(-0.3f, -0.7f, -0.6f));
@ -1630,7 +1635,7 @@ glm::mat4 Renderer::computeLightSpaceMatrix() {
glm::vec3 center = shadowCenter;
// Texel snapping: round center to shadow texel boundaries to prevent shimmer
float halfExtent = 120.0f;
float halfExtent = kShadowHalfExtent;
float texelWorld = (2.0f * halfExtent) / static_cast<float>(SHADOW_MAP_SIZE);
// Build light view to get stable axes
@ -1639,7 +1644,7 @@ glm::mat4 Renderer::computeLightSpaceMatrix() {
if (std::abs(glm::dot(sunDir, up)) > 0.99f) {
up = glm::vec3(0.0f, 1.0f, 0.0f);
}
glm::mat4 lightView = glm::lookAt(center - sunDir * 200.0f, center, up);
glm::mat4 lightView = glm::lookAt(center - sunDir * kShadowLightDistance, center, up);
// Snap center in light space to texel grid
glm::vec4 centerLS = lightView * glm::vec4(center, 1.0f);
@ -1650,13 +1655,19 @@ glm::mat4 Renderer::computeLightSpaceMatrix() {
shadowCenter = center;
// Rebuild with snapped center
lightView = glm::lookAt(center - sunDir * 200.0f, center, up);
glm::mat4 lightProj = glm::ortho(-halfExtent, halfExtent, -halfExtent, halfExtent, 1.0f, 400.0f);
lightView = glm::lookAt(center - sunDir * kShadowLightDistance, center, up);
glm::mat4 lightProj = glm::ortho(-halfExtent, halfExtent, -halfExtent, halfExtent,
kShadowNearPlane, kShadowFarPlane);
return lightProj * lightView;
}
void Renderer::renderShadowPass() {
constexpr float kShadowHalfExtent = 180.0f;
constexpr float kShadowLightDistance = 280.0f;
constexpr float kShadowNearPlane = 1.0f;
constexpr float kShadowFarPlane = 600.0f;
// Compute light space matrix
lightSpaceMatrix = computeLightSpaceMatrix();
@ -1698,11 +1709,12 @@ void Renderer::renderShadowPass() {
// For simplicity, compute the split:
glm::vec3 sunDir = glm::normalize(glm::vec3(-0.3f, -0.7f, -0.6f));
glm::vec3 center = shadowCenterInitialized ? shadowCenter : characterPosition;
float halfExtent = 120.0f;
float halfExtent = kShadowHalfExtent;
glm::vec3 up(0.0f, 0.0f, 1.0f);
if (std::abs(glm::dot(sunDir, up)) > 0.99f) up = glm::vec3(0.0f, 1.0f, 0.0f);
glm::mat4 lightView = glm::lookAt(center - sunDir * 200.0f, center, up);
glm::mat4 lightProj = glm::ortho(-halfExtent, halfExtent, -halfExtent, halfExtent, 1.0f, 400.0f);
glm::mat4 lightView = glm::lookAt(center - sunDir * kShadowLightDistance, center, up);
glm::mat4 lightProj = glm::ortho(-halfExtent, halfExtent, -halfExtent, halfExtent,
kShadowNearPlane, kShadowFarPlane);
// WMO renderShadow needs a Shader reference — but it only uses setUniform("uModel", ...)
// We'll create a thin wrapper. Actually, WMO's renderShadow takes a Shader& and calls