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Distance-cull terrain derivative normal mapping

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Fade bump strength from full at 50 units to zero at 125 units to
avoid noisy/harsh appearance on distant terrain.
This commit is contained in:
Kelsi 2026-02-23 10:54:56 -08:00
parent 9a1b78bffd
commit bf997e1900
2 changed files with 7 additions and 6 deletions
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13
assets/shaders/terrain.frag.glsl
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@ -86,15 +86,17 @@ void main() {
vec3 norm = normalize(Normal); vec3 norm = normalize(Normal);
// Derivative-based normal mapping: perturb vertex normal using texture detail // Derivative-based normal mapping: perturb vertex normal using texture detail.
{ // Fade out with distance — looks noisy/harsh beyond ~100 units.
float fragDist = length(viewPos.xyz - FragPos);
float bumpFade = 1.0 - smoothstep(50.0, 125.0, fragDist);
if (bumpFade > 0.001) {
float lum = dot(finalColor.rgb, vec3(0.299, 0.587, 0.114)); float lum = dot(finalColor.rgb, vec3(0.299, 0.587, 0.114));
float dLdx = dFdx(lum); float dLdx = dFdx(lum);
float dLdy = dFdy(lum); float dLdy = dFdy(lum);
vec3 dpdx = dFdx(FragPos); vec3 dpdx = dFdx(FragPos);
vec3 dpdy = dFdy(FragPos); vec3 dpdy = dFdy(FragPos);
// Bump strength controls how much texture detail affects lighting float bumpStrength = 9.0 * bumpFade;
const float bumpStrength = 9.0;
vec3 perturbation = (dLdx * cross(norm, dpdy) + dLdy * cross(dpdx, norm)) * bumpStrength; vec3 perturbation = (dLdx * cross(norm, dpdy) + dLdy * cross(dpdx, norm)) * bumpStrength;
vec3 candidate = norm - perturbation; vec3 candidate = norm - perturbation;
float len2 = dot(candidate, candidate); float len2 = dot(candidate, candidate);
@ -123,8 +125,7 @@ void main() {
vec3 result = ambient + shadow * diffuse; vec3 result = ambient + shadow * diffuse;
float distance = length(viewPos.xyz - FragPos); float fogFactor = clamp((fogParams.y - fragDist) / (fogParams.y - fogParams.x), 0.0, 1.0);
float fogFactor = clamp((fogParams.y - distance) / (fogParams.y - fogParams.x), 0.0, 1.0);
result = mix(fogColor.rgb, result, fogFactor); result = mix(fogColor.rgb, result, fogFactor);
outColor = vec4(result, 1.0); outColor = vec4(result, 1.0);

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assets/shaders/terrain.frag.spv
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