Casting shadows with custom shader

Help & Support
6

I believe I have something working now!

I added a “customAttributes” flag to the pc.StandardMaterial options, like so:

var material = new pc.StandardMaterial();
material.onUpdateShader = function (options) {
    options.useInstancing = true;
    options.customAttributes = true;
    return options;
};

And then I monkey patched the createShaderDefinition function to add extra attributes:

var origFunc = pc.programlib.standard.createShaderDefinition;
pc.programlib.standard.createShaderDefinition = function createShaderDefinition(device, options) {
    var result = origFunc.apply(this, [device, options]);
    if (options.customAttributes) {
        result.attributes['MY_CUSTOM_ATTRIBUTE_1'] = pc.SEMANTIC_TEXCOORD6;
        result.attributes['MY_CUSTOM_ATTRIBUTE_2'] = pc.SEMANTIC_ATTR2;
        ...
        result.attributes['MY_CUSTOM_ATTRIBUTE_5'] = pc.SEMANTIC_ATTR5;
    }

    return result;
}

This may be similar to what was suggested in this post: Custom vertex attributes in chunk

I’d love to hear back if there is a better way to do this, but I think we’re unblocked for now. Thanks for the help and suggestions, everyone.

3 Likes