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feat: add sun height attenuation and warm sunset tint to lens flare

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Reduce flare intensity when sun is near the horizon via smoothstep on
sunDir.z (0→0.25 range). Apply amber/orange color shift to flare elements
at sunrise/sunset for a warm golden glow. Prevents overly bright flares
at low sun angles while enhancing atmospheric mood.
This commit is contained in:
Kelsi 2026-03-20 16:34:11 -07:00
parent bf62061a31
commit ae18d25996
1 changed files with 16 additions and 2 deletions
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18
src/rendering/lens_flare.cpp
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@ -313,8 +313,12 @@ void LensFlare::render(VkCommandBuffer cmd, const Camera& camera, const glm::vec
return;
}
// Sun height attenuation — flare weakens when sun is near horizon (sunrise/sunset)
float sunHeight = sunDir.z; // z = up in render space; 0 = horizon, 1 = zenith
float heightFactor = glm::smoothstep(-0.05f, 0.25f, sunHeight);
// Atmospheric attenuation — fog, clouds, and weather reduce lens flare
float atmosphericFactor = 1.0f;
float atmosphericFactor = heightFactor;
atmosphericFactor *= (1.0f - glm::clamp(fogDensity * 0.8f, 0.0f, 0.9f)); // Heavy fog nearly kills flare
atmosphericFactor *= (1.0f - glm::clamp(cloudDensity * 0.6f, 0.0f, 0.7f)); // Clouds attenuate
atmosphericFactor *= (1.0f - glm::clamp(weatherIntensity * 0.9f, 0.0f, 0.95f)); // Rain/snow heavily attenuates
@ -339,6 +343,9 @@ void LensFlare::render(VkCommandBuffer cmd, const Camera& camera, const glm::vec
VkDeviceSize offset = 0;
vkCmdBindVertexBuffers(cmd, 0, 1, &vertexBuffer, &offset);
// Warm tint at sunrise/sunset — shift flare color toward orange/amber when sun is low
float warmTint = 1.0f - glm::smoothstep(0.05f, 0.35f, sunHeight);
// Render each flare element
for (const auto& element : flareElements) {
// Calculate position along sun-to-center axis
@ -347,12 +354,19 @@ void LensFlare::render(VkCommandBuffer cmd, const Camera& camera, const glm::vec
// Apply visibility, intensity, and atmospheric attenuation
float brightness = element.brightness * visibility * intensityMultiplier * atmosphericFactor;
// Apply warm sunset/sunrise color shift
glm::vec3 tintedColor = element.color;
if (warmTint > 0.01f) {
glm::vec3 warmColor(1.0f, 0.6f, 0.25f); // amber/orange
tintedColor = glm::mix(tintedColor, warmColor, warmTint * 0.5f);
}
// Set push constants
FlarePushConstants push{};
push.position = position;
push.size = element.size;
push.aspectRatio = aspectRatio;
push.colorBrightness = glm::vec4(element.color, brightness);
push.colorBrightness = glm::vec4(tintedColor, brightness);
vkCmdPushConstants(cmd, pipelineLayout,
VK_SHADER_STAGE_VERTEX_BIT | VK_SHADER_STAGE_FRAGMENT_BIT,