取得/設定 custom property

 {
    struct KzuPropertyType* UV_SET; 
    struct KzcVector4 uvs;

    //get property type
    UV_SET = kzuPropertyRegistryFindPropertyType("uv_modify");
    kzsAssert(kzcIsValidPointer(UV_SET));

    //get property
    uvs = kzuObjectNodeGetVector4PropertyDefault(textrue_font->planeNode, UV_SET);
    uvs.data[0] = (kzFloat)(uv_sets[index].x);
    uvs.data[1] = (kzFloat)(uv_sets[index].y);
    uvs.data[2] = (kzFloat)(uv_sets[index].z);
    uvs.data[3] = (kzFloat)(uv_sets[index].w);

    //set property
    result = kzuObjectNodeSetVector4Property(textrue_font->planeNode, UV_SET, uvs);
    kzsErrorForward(result);
}

在scene node底下的mesh的material，可以從node就直接get property來set，不用去get它的material