topic Re: GetUVGen() for CHECKER_CLASS_ID in 3ds Max Programming Forum

GetUVGen() for CHECKER_CLASS_ID

istan — Mon, 12 Feb 2024 16:14:40 GMT

auto tmap = (::Texmap *) ip->CreateInstance( TEXMAP_CLASS_ID, Class_ID( CHECKER_CLASS_ID, 0 ) ); BitmapTex * bmt = dynamic_cast<BitmapTex *> ( tmap ); StdUVGen * uv = bmt->GetUVGen(); // <<< FAILS!

I need access to "StdUVGen" but have no idea, how to get the pointer for a checker map.

All the samples just show it for a Bitmap map.

Re: GetUVGen() for CHECKER_CLASS_ID

denisT.MaxDoctor — Mon, 12 Feb 2024 21:07:53 GMT

I confirm the failure.

Well... use the GetTheUVGen method of the Texmap class.

Re: GetUVGen() for CHECKER_CLASS_ID

denisT.MaxDoctor — Mon, 12 Feb 2024 21:13:40 GMT

auto tmap = (::Texmap *) ip->CreateInstance( TEXMAP_CLASS_ID, Class_ID( CHECKER_CLASS_ID, 0 ) );
BitmapTex * bmt = dynamic_cast<BitmapTex *> ( tmap );

Why do you cast Checker to BitmapTex? It doesn't seem right...
But as I mentioned earlier, BitmapTex::GetUVGen doesn't work for me.

Re: GetUVGen() for CHECKER_CLASS_ID

denisT.MaxDoctor — Mon, 12 Feb 2024 22:17:26 GMT

You can cast after that:

if (auto tex = (Texmap*)max_ip()->CreateInstance(TEXMAP_CLASS_ID, Class_ID(CHECKER_CLASS_ID, 0))) { UVGen* uvgen = tex->GetTheUVGen(); StdUVGen* uvstd = dynamic_cast<StdUVGen*>(uvgen); ...

Re: GetUVGen() for CHECKER_CLASS_ID

klvnk — Mon, 12 Feb 2024 22:14:42 GMT

you can't cast a Checker map to a BitmapTex and expect it to work 🙂

do it this way...

Texmap *checkerMap = (Texmap *) CreateInstance(TEXMAP_CLASS_ID, Class_ID(CHECKER_CLASS_ID,0)); StdUVGen *uvGen = (StdUVGen*)checkerMap->GetTheUVGen();

to be precise you should get a UVGen first, then check to see it thats a StdUVGen with UVGen::IsStdUVGen () then cast to StdUVGen, but hey ho 😄

Re: GetUVGen() for CHECKER_CLASS_ID

A012255 — Mon, 12 Feb 2024 22:19:22 GMT

You are right. This is it:

StdUVGen * uv = (StdUVGen *) tmap->GetTheUVGen();

Re: GetUVGen() for CHECKER_CLASS_ID

A012255 — Mon, 12 Feb 2024 22:20:03 GMT

Thanks to everybody!

Re: GetUVGen() for CHECKER_CLASS_ID

denisT.MaxDoctor — Mon, 12 Feb 2024 22:22:30 GMT

We worked in parallel... 😉

It seems like the direct GetUVGen method BitmapTex is not functioning properly.

Re: GetUVGen() for CHECKER_CLASS_ID

klvnk — Mon, 12 Feb 2024 22:28:20 GMT

I checked it in our exporter seems fine if it is an Actual BitmapTex

Re: GetUVGen() for CHECKER_CLASS_ID

denisT.MaxDoctor — Mon, 12 Feb 2024 22:34:14 GMT

if (auto tex = (Texmap*)max_ip()->CreateInstance(TEXMAP_CLASS_ID, Class_ID(CHECKER_CLASS_ID, 0))) { UVGen* uvgen = tex->GetTheUVGen(); StdUVGen* uvstd = dynamic_cast<StdUVGen*>(uvgen); ...

My understanding is that GetTheUVGen returns StdUVGen in general... otherwise dynamic_cast should not have worked. Wouldn't it?

Re: GetUVGen() for CHECKER_CLASS_ID

istan — Tue, 13 Feb 2024 07:40:31 GMT

UVGen* uvg0 = tex->GetTheUVGen(); if (uvg0 && uvg0->IsStdUVGen()) { StdUVGen *uvg = (StdUVGen*)uvg0; uvg->InitSlotType(MAPSLOT_ENVIRON); uvg->SetCoordMapping(UVMAP_SPHERE_ENV); }

Look at this code snippet from the examples. IMHO it's self explaining (if it's working).

For me all clarified. Thank you Denis & klvnk.

Re: GetUVGen() for CHECKER_CLASS_ID

denisT.MaxDoctor — Tue, 13 Feb 2024 09:12:14 GMT

Here is what the header says:

virtual BOOL IsStdUVGen() { return FALSE; } // class StdUVGen implements this to return TRUE

virtual (!)

The question is: if it's not StdUVGen, what is it? The documentation mentions either StdXYZGen or a custom 🤣

Re: GetUVGen() for CHECKER_CLASS_ID

klvnk — Tue, 13 Feb 2024 10:11:19 GMT

a custom implementation that derives from UVGen that returns false from IsStdUVGen

Re: GetUVGen() for CHECKER_CLASS_ID

denisT.MaxDoctor — Tue, 13 Feb 2024 10:18:53 GMT

@klvnk wrote:
a custom implementation that derives from UVGen that returns false from IsStdUVGen

Yes. What is about StdXYZGen?

Re: GetUVGen() for CHECKER_CLASS_ID

denisT.MaxDoctor — Tue, 13 Feb 2024 11:09:38 GMT

Haha! I found how easy to crash the MAX:

meditmaterials[1] = c = checker() c.coords = StandardXYZGen()

... and try to open the Material Editor 😜

~~but for texmaps those need StdXYZGen it's safe:~~

meditmaterials[2] = d = dent() d.coords = StandardUVGen()

PS. No! Both setting UV in place of XYZ or XYZ in place of UV will cause MAX to crash

This is interesting because I can't find a way to check what type of Map Coordinates a texture map class needs.