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 написал

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();