GetMaterial returns NULL

[gamecreator]

Does anyone have any idea why the following code would return NULL?

 

Material* material = player.model->GetMaterial();

 

The entity does have a material and loads fine in the program. What else could cause the code to return NULL?

[Josh]

The entity has no material, but the model surface(s) each have a material.

[gamecreator]

Thanks. I think this did come up before.

 

It is a little confusing though since the example on this page does it a lot like I did.

http://www.leadwerks.com/werkspace/page/api-reference/_/entity/entitygetmaterial-r127'>http://www.leadwerks.com/werkspace/page/api-reference/_/entity/entitygetmaterial-r127

 

Material* material = entity->GetMaterial();

 

Also, GetMaterial is one of the functions on the Entity page.

http://www.leadwerks.com/werkspace/page/api-reference/_/entity/

[gamecreator]

I tried

 

Material* material = player.model->GetSurface(0)->GetMaterial();

 

And it crashed the program. The console said "Error: Surface index out of range."

 

I tried GetSurface(1) and same thing.

 

Then I thought maybe I need to get a child first, which seems reasonable, even though the GetSurface example on the Barbarian model doesn't do that.

 

Material* material = player.model->GetChild(1)->GetSurface(0)->GetMaterial();

 

which got me

 

Error 12 error C2227: left of '->GetMaterial' must point to class/struct/union/generic type

Error 11 error C2039: 'GetSurface' : is not a member of 'Leadwerks::Entity'

 

Thoughts?

[martyj]

Use surfaces vector.

 

player.model->surfaces[0]->GetMaterial() ?

[gamecreator]

Thank for the suggestion but that crashed the program. The example from the surface documentation does

 

Surface* surface = model->GetSurface(0);

 

but if the GetMaterial example is incorrect then maybe this is too?

[Josh]

GetChild() returns an entity:

Material* material = ((Model*)player.model->GetChild(1))->GetSurface(0)->GetMaterial();

[gamecreator]

Thanks! That worked. It's still crashing when I try to implement it in the SetPixels example but I'll take a moment to try to figure that one out.

[Crazycarpet]

Thanks! That worked. It's still crashing when I try to implement it in the SetPixels example but I'll take a moment to try to figure that one out.

 

I noticed when implementing a system today that even on some surfaces GetMaterial() returns null.... So I guess some surfaces simply don't have materials on them, just check and make sure 'Surface::GetMaterial() != NULL'.

 

I noticed this in a similar situation, when I was relying on the fact that Surface::GetMaterial() never returned null, when in fact it does in many cases so I had some crashing til I did a check to make sure the returned value isn't NULL, now I'm getting the expected behavior.

[gamecreator]

Yeah, some of this is still a mystery. I wonder what the difference between the barbarian model is that you don't need to get its child in the example versus mine. But I don't have time to get too distracted. Gotta work on some simple animations!