Change texture use external texture in UE5

edogawa_ai

hello guys!

I want to change the texture of an attachment with an external texture.

I passed a UTexture2D from blueprint to cpp. Then use the following code to change the texture.

Attachment *attachment = slot->getAttachment();

RegionAttachment* atta = (RegionAttachment*)attachment;

AtlasPage *page = NULL;
char *name = TCHAR_TO_ANSI(*texture->GetName());
UE_LOG(LogTemp, Log, TEXT("name is:%s"), TCHAR_TO_UTF8(*SlotName));
page = new (__FILE__, __LINE__) AtlasPage(TCHAR_TO_UTF8(*SlotName));
page->setRendererObject(texture);
page->texturePath = TCHAR_TO_UTF8(*texture->GetPathName());
page->width = texture->GetSizeX();
page->height = texture->GetSizeY();
page->uWrap = TextureWrap_ClampToEdge;
page->vWrap = TextureWrap_ClampToEdge;
UE_LOG(LogTemp, Log, TEXT("width is:%d, height is:%d"), page->width, page->height);

AtlasRegion *region = new (__FILE__, __LINE__) AtlasRegion();
region->width = texture->GetSizeX();
region->height = texture->GetSizeY();
region->originalWidth = texture->GetSizeX();
region->originalHeight = texture->GetSizeY();

region->page = page;
region->u = 0;
region->v = 0;
region->u2 = 1;
region->u2 = 1;
region->degrees = 0;
region->offsetX = 0;
region->offsetY = 0;

atta->setRendererObject(region);
atta->updateOffset();

Now the output is the following picture. The head(which I am trying to change) disappears and nothing shows 😢 .

I kinda have no idea where to go now.

Could anyone help me with this? Thanks! 🙂

Mario

Your could is actually pretty good, however, it will eventually be overwritten by this:
https://github.com/EsotericSoftware/spine-runtimes/blob/4.0/spine-ue4/Plugins/SpinePlugin/Source/SpinePlugin/Private/SpineSkeletonRendererComponent.cpp#L269

Sadly, there's currently no way to allow setting a texture on a specific attachment, due to how me have to manage materials and blend modes in UE4/5.

edogawa_ai

Mario escreveu
Your could is actually pretty good, however, it will eventually be overwritten by this:
https://github.com/EsotericSoftware/spine-runtimes/blob/4.0/spine-ue4/Plugins/SpinePlugin/Source/SpinePlugin/Private/SpineSkeletonRendererComponent.cpp#L269

Sadly, there's currently no way to allow setting a texture on a specific attachment, due to how me have to manage materials and blend modes in UE4/5.

Thank you, Mario!

According to the source code you pointed to, I found out a way to do this. I add following modification to my code to force to recreate the material.

skeleton->Atlas->GetAtlas()->getPages().add(page);
skeleton->Atlas->atlasPages.Add(texture);

Now the output is right now as the following screenshot.

In case someone need the same function in the future, I paste the code here. (Maybe need more test for it)

RegionAttachment* atta = (RegionAttachment*)attachment;

           auto oldRegion = (AtlasRegion*)atta->getRendererObject();
           auto oldPage = oldRegion->page;

           AtlasPage *page = NULL;
           char *name = TCHAR_TO_ANSI(*texture->GetName());
           page = new (__FILE__, __LINE__) AtlasPage(TCHAR_TO_UTF8(*slotName));
           page->setRendererObject(texture);

           page->name = oldPage->name;
           page->texturePath = oldPage->texturePath;

           page->width = texture->GetSizeX();
           page->height = texture->GetSizeY();
           page->uWrap = TextureWrap_ClampToEdge;
           page->vWrap = TextureWrap_ClampToEdge;
           UE_LOG(LogTemp, Log, TEXT("width is:%d, height is:%d"), page->width, page->height);
           UE_LOG(LogTemp, Log, TEXT("old page:width is:%d, height is:%d"), oldPage->width, oldPage->height);

           AtlasRegion *region = new (__FILE__, __LINE__) AtlasRegion();
           region->width = texture->GetSizeX();
           region->height = texture->GetSizeY();
           region->originalWidth = texture->GetSizeX();
           region->originalHeight = texture->GetSizeY();

           region->page = page;
           region->u = 0;
           region->v = 0;
           region->u2 = 1;
           region->v2 = 1;
           region->degrees = 0;
           region->offsetX = 0;
           region->offsetY = 0;

           skeleton->Atlas->GetAtlas()->getPages().add(page);
           skeleton->Atlas->atlasPages.Add(texture);

           atta->setRendererObject(region);
           atta->setUVs(0, 0, 1, 1, 0);
           atta->updateOffset();

Mario

Ohhh, I didn't think of modifying the altas itself! Good stuff, thanks for posting it here.