Create new appearance with RGB color

[Anonymous]

I'm trying to follow Mr Ekins' code to create a new appearance  and assign a color to it, then add this new appearance to a Brep face.

It's going wrong in the CAST line (and probably elsewhere.

HELP!

// create appearance first
Ptr<MaterialLibraries> matlib = app->materialLibraries();
Ptr<Appearance> yellowc = matlib->itemByName("Paint - Enamel Glossy (Yellow)");
Ptr<Appearance> newc = FA->addByCopy(yellowc, "MyGreen");
Ptr<Appearances> prop1 = newc->appearanceProperties();

Ptr<ColorProperty> cprop = adsk::core::ColorProperty::cast(prop1->itemByName("color"));  // WRONG HERE
cprop->value = adsk::core::Color::create(0, 255, 0,0);

bool retval = bfaceCyl->appearance(newc);

[Anonymous]

OK - got the answer should anyone need it in the future:

// add RGB colour to cylinder
Ptr<Appearances> FA = design->appearances();
Ptr<Appearance> C1 = FA->itemByName("MyGreen");

if (C1) {
// appearance exists
bool retval = bfaceCyl->appearance(C1);

}else{
// create appearance first
Ptr<MaterialLibraries> matlibs = app->materialLibraries();
Ptr<MaterialLibrary> matlib = matlibs->itemByName("Fusion 360 Appearance Library");
Ptr<Appearances> apps = matlib->appearances();
Ptr<Appearance> yellowc = apps->itemByName("Paint - Enamel Glossy (Yellow)");
Ptr<Appearance> newc = FA->addByCopy(yellowc, "MyGreen");
Ptr<Properties> prop1 = newc->appearanceProperties();

Ptr<ColorProperty> cprop = prop1->itemByName("Color");
cprop->value(adsk::core::Color::create(0, 255, 0, 0));

bool retval = bfaceCyl->appearance(newc);
}

[BrianEkins · Accepted solution]

Just catching up on the forum so I'm a little late to this but here's a blog post from a while ago that goes over this.

https://ekinssolutions.com/setting-colors-in-fusion-360/