Create Spherical Polynomial Lighting

Questions
22

That makes sense for the load. But you cant seem to be able to override then, like setting the sphericalPolynomial = new BABYLON.SpericalPolynomials() i would expect to BLACK or ZERO them out… Or is that not the expexted behavior ?

23

Yo @sebavan… Found a workaround. It seems if you pass null for irrandiance in the json… I think it forces the creation of polynomials for .env files:

babylonTexture.forceSphericalPolynomialsRecompute();

But I found a worka rounnd to pass all black irradiance, and then i can reset later with Unity SH:

My ENVPacker JSON encoder now default black when i want to override

        // Build a simple manifest string matching EnvironmentTextureInfo v2 used by BabylonJS
        // We'll set irradiance to black (zero) spherical harmonics and include specular.mipmaps array + lodGenerationScale
        var sb = new StringBuilder();
        sb.Append('{');
        sb.Append("\"version\":2,");
        sb.AppendFormat("\"width\":{0},", baseSize);
        sb.AppendFormat("\"imageType\":\"{0}\",", imageType);
        
        // Add black spherical harmonics (9 SH coefficient types: x, y, z, xx, yy, zz, yz, zx, xy; each with 3 RGB values)
        sb.Append("\"irradiance\":{");
        sb.Append("\"x\":[0,0,0],");
        sb.Append("\"y\":[0,0,0],");
        sb.Append("\"z\":[0,0,0],");
        sb.Append("\"xx\":[0,0,0],");
        sb.Append("\"yy\":[0,0,0],");
        sb.Append("\"zz\":[0,0,0],");
        sb.Append("\"yz\":[0,0,0],");
        sb.Append("\"zx\":[0,0,0],");
        sb.Append("\"xy\":[0,0,0]");
        sb.Append("},");
        
        sb.Append("\"specular\":{");
        // mipmaps
        sb.Append("\"mipmaps\":[");
        for (int i = 0; i < specularArray.Count; i++)
        {
            var d = specularArray[i];
            sb.Append('{');
            sb.AppendFormat("\"length\":{0},\"position\":{1}", d["length"], d["position"]);
            sb.Append('}');
            if (i + 1 < specularArray.Count) sb.Append(',');
        }
        sb.Append("],");
        sb.AppendFormat("\"lodGenerationScale\":{0},", lodGenerationScale.ToString(System.Globalization.CultureInfo.InvariantCulture));
        sb.AppendFormat("\"lodGenerationOffset\":{0}", lodGenerationOffset.ToString(System.Globalization.CultureInfo.InvariantCulture));
        sb.Append("}");
        sb.Append('}');
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