Paper2d sprite scale

Development Asset Creation
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1

What controls a paper 2d sprite size when generated by C++?

At the moment, in order to apply my own material, I’m duplicating a blueprint APaperSpriteActor. In the actor I’ve setup a sprite with my material.

	m_SpriteActor = smp_World->SpawnActorDeferred<APaperSpriteActor>(smp_Class, FVector::ZeroVector, FRotator(0.0f, 180.0f, -90.0f), smp_Owner);
	if (m_SpriteActor.IsValid())
	{
		FSpriteAssetInitParameters initParams;
		initParams.SetTextureAndFill(mp_Texture);
		UPaperSprite *pNewSprite = DuplicateObject<UPaperSprite>(m_SpriteActor->GetRenderComponent()->GetSprite(), m_SpriteActor.Get(), _T("DuplicatedSprite"));
		pNewSprite->InitializeSprite(initParams);
		m_SpriteActor->GetRenderComponent()->SetMobility(EComponentMobility::Movable);
		m_SpriteActor->GetRenderComponent()->SetSprite(pNewSprite);

This seems a bit convoluted but I couldn’t find a c++ interface to set my own material or change the sprite material to translucent. Once I resolve this I’m going to be rendering text and other shapes onto a texture for the sprite, which I’m mainly using as a method for rendering 2d at a depth in my scene.

I’m then using SetActorScale3D to scale the actor to fit a predefined 3d size. This works in essence but not practice as different textures have different resultant 3d sizes.

How is the sprite size calculated?

2

Looks like the pixels per unit is defaulting to 100. I can’t see how to set this in C++ however can create an extra scaling factor that when multiplied into my calculated actor scale gives me a sprite of the expected size.

		m_Scale.Set(100.0f / mp_Texture->GetSurfaceWidth(), 100.0f / mp_Texture->GetSurfaceHeight());

Voodoo? Yes. Functional? Yes. Shippable? Time will tell!

3

If you don’t mind me asking, what did time tell you about the shippability of this solution? :slight_smile: