topic Re: How to get U_Offset/V_Offset from UVTransform matrix of texmap with C++ API? in 3ds Max Programming Forum

How to get U_Offset/V_Offset from UVTransform matrix of texmap with C++ API?

jeremyliu1989 — Mon, 02 Dec 2019 14:45:09 GMT

Hey, all:

I could get the UVTransform Matrix from with the GetUVTransform(Matrix3 & uvtrans) .

My question is, how can I calculate the U_Offset or V_Offset from above Matrix3?

Thanks for any suggestion.

Re: How to get U_Offset/V_Offset from UVTransform matrix of texmap with C++ API?

Swordslayer — Tue, 03 Dec 2019 07:43:48 GMT

That's just the transform, what you want is to get the StdUVGen and use GetUOffs/GetVOffs, something like

auto coords = map.GetTheUVGen();
if (coords && coords->IsStdUVGen()) {
	auto const stdUVCoords = static_cast<StdUVGen*>(coords);
	/* do something with stdUVCoords->GetUOffs(time) */
}

Re: How to get U_Offset/V_Offset from UVTransform matrix of texmap with C++ API?

jeremyliu1989 — Wed, 04 Dec 2019 12:02:48 GMT

Thanks, I have got what I want from UVGen. Appreciate for that.

Re: How to get U_Offset/V_Offset from UVTransform matrix of texmap with C++ API?

Phil_Morgan — Fri, 27 Sep 2024 09:47:35 GMT

auto coords = map.GetTheUVGen();
if (coords && coords->IsStdUVGen()) {
	auto const stdUVCoords = static_cast<StdUVGen*>(coords);
	/* do something with stdUVCoords->GetUOffs(time) */
}

Sorry to bring up this old topic. But I have the same question now, but I need to do it with MaxScript. Is this possible? If not, how can I compile the above C++ code in maxscript? Thanks for any help!

Re: How to get U_Offset/V_Offset from UVTransform matrix of texmap with C++ API?

denisT.MaxDoctor — Sun, 29 Sep 2024 06:59:21 GMT

MXS equivalent of the above:

map = bitmaptexture() ------------------- map.coords.U_Offset map.coords.V_Offset

but I think you need something else...

Re: How to get U_Offset/V_Offset from UVTransform matrix of texmap with C++ API?

Phil_Morgan — Sun, 29 Sep 2024 12:22:15 GMT

@denisT.MaxDoctor wrote:
MXS equivalent of the above:

map = bitmaptexture() ------------------- map.coords.U_Offset map.coords.V_Offset

but I think you need something else...

I know about these Bitmaptexture properties. But that's not what I need.
I don't have the original texturemap, but I do have the data from the .coords.UVTransform property from original texturemap as matrix. Now I need to create a texture map by applying the data from this matrix to it.

More details in this thread: https://forums.autodesk.com/t5/3ds-max-programming/how-to-get-bitmaptexture-coordinates-property-from-uvtransform/m-p/13052622/