topic Re: ExecuteMAXScriptScript issue. in 3ds Max Programming Forum

ExecuteMAXScriptScript issue.

klvnk — Thu, 12 Oct 2023 16:11:52 GMT

when the a script is run that returns a Color with an alpha the return FPValue of

Color 255 255 255 254

is of TYPE_FRGBA_BV, all well and good. the resultant aclr of the FPValue is 1.0,1.0,1.0 0.99607849.

though if it returns something like

Color 255 255 255 255

the resultant aclr is 1.0,1.0,1.0,0.0

any alpha value of 255 results in zero being returned

😕

Re: ExecuteMAXScriptScript issue.

klvnk — Fri, 13 Oct 2023 08:34:32 GMT

though

c = Color 123 111 96 255 c as Point4

and

c = Color 123 111 96 255 b = Color 4 56 192 255 #(c,b)

both work as expected :?

Re: ExecuteMAXScriptScript issue.

denisT.MaxDoctor — Fri, 13 Oct 2023 10:55:49 GMT

I can't reproduce the issue. I try to execute the string in different ways and try to compile the string, and each time I get the expected result where the alpha is 255.0 as was passed.

Re: ExecuteMAXScriptScript issue.

klvnk — Fri, 13 Oct 2023 11:48:58 GMT

should be 1.0 as it's passed as the AColor* FPValue::aclr;

Re: ExecuteMAXScriptScript issue.

klvnk — Fri, 13 Oct 2023 12:33:04 GMT

this should reproduce it

def_visible_primitive(runscript, "runscript"); Value* runscript_cf(Value** arg_list, int count) { enum args { kscript, kquiet, knum_args }; check_arg_count(runscript, knum_args, count); FPValue result; ExecuteMAXScriptScript(arg_list[kscript]->to_string(), arg_list[kquiet]->to_int(), &result); return new Point4Value(result.aclr->r, result.aclr->g, result.aclr->b, result.aclr->a); }

then try....

runscript "c = color 128 128 128 255;\nc;" true

in the listener, followed by...

runscript "c = color 128 128 128 254;\nc;" true

Re: ExecuteMAXScriptScript issue.

klvnk — Fri, 13 Oct 2023 13:02:15 GMT

I think i know what's happening now when it sees the 255 as the alpha it changes it from a "AColor" to a "Color" so therefore passed in the FPValue::clr. I wasn't paying enough attention to the FPValue::type field and the crazy nature of c/cpp unions 🙂

Re: ExecuteMAXScriptScript issue.

denisT.MaxDoctor — Fri, 13 Oct 2023 23:49:03 GMT

check InterfaceFunction::FPValue_to_val

Re: ExecuteMAXScriptScript issue.

klvnk — Sat, 14 Oct 2023 16:27:32 GMT

I already use it for the mxs function, this issue came up in a com server implementation which returns variants and or safearrays...

the fix was one line...

case TYPE_FRGBA_BV: case TYPE_COLOR_BV: { if (ret.type == TYPE_COLOR_BV) ret.aclr->a = 1.0f; var_safearray_from_val<float>(4, (float *)ret.aclr, result); break; }