Unlike modern versions, 1.8.9 does not support depth or velocity buffers easily, so this shader creates a – a simple but effective effect that smooths movement and gives a sense of speed. 📁 File Structure (inside your shaderpack folder) YourShaderpack/ ├── shaders/ │ ├── final.fsh │ ├── final.vsh │ └── (optional: gbuffers_terrain.vsh, etc. – not needed for this simple version) └── shaders.properties 🔧 1. final.vsh (vertex shader) #version 120 varying vec2 texcoord;
/* ALTERNATIVE: directional blur (if you had velocity data) But for 1.8.9, basic frame blending is safer and more reliable */
// Motion blur strength – adjust to taste (0.05 = subtle, 0.25 = strong) const float blurStrength = 0.12; minecraft 1.8.9 motion blur shader
gl_FragColor = result; ⚠️ : This uses two color buffers. To make it work, you must add this to your shaders.properties : # shaders.properties colortex0.clear=true colortex1.clear=true colortex1.colorbuffer=colortex0 This tells OptiFine to keep the previous frame in colortex0 and the new one in colortex1 . 🧪 3. Simple alternative (single‑buffer motion blur) If the above doesn't work on your OptiFine version, here's a simpler version that only uses one color buffer but creates a fade effect:
// Real implementation for 1.8.9 requires gbuffers_texture, but that's complex. // Better to use the two-buffer method above. Unlike modern versions, 1
#version 120 varying vec2 texcoord;
const float fadeFactor = 0.85; // lower = more blur/trail const float fadeFactor = 0.85
// Sample current scene (you'd need the actual scene texture) // For simplicity: just blend previous frame with white/grey vec4 scene = vec4(0.5, 0.5, 0.5, 1.0); // dummy – won't work well
uniform sampler2D colortex0; // previous frame's color uniform sampler2D colortex1; // current frame's color (for blending) uniform float viewWidth; uniform float viewHeight;
gl_FragColor = current * fadeFactor;
void main() gl_Position = ftransform(); texcoord = gl_MultiTexCoord0.xy;