Apologies if this is the wrong place, not sure where else to put this. 

I want to apply a grid texture to objects in poser, as a means of determining perspective points. I'd image for pros this is absurdly easy to do, but I can't figure it out. Would anyone be able to help out?

Thanks in advance!

The textures of figures/props can be changed in the Material Room.  The object should be UVMapped and the grid texture should be properly fitted to the map, otherwise, the texture will not project correctly.  I would recommend that the resolution of the grid texture be at a minimum of 1024x1024 and a maximum of 2048x2048.  A higher texture resolution could slow down rendering speed.

From top menu select: Display --> Paper Texture --> Grid ... or to change the way the document is displayed, select: Display --> Document Style --> Wireframe, Outline, Smooth Shaded Lined, etc

From top menu select: Display --> Paper Texture --> Grid ... or to change the way the document is displayed, select: Display --> Document Style --> Wireframe, Outline, Smooth Shaded Lined, etc

The textures of figures/props can be changed in the Material Room.  The object should be UVMapped and the grid texture should be properly fitted to the map, otherwise, the texture will not project correctly.  I would recommend that the resolution of the grid texture be at a minimum of 1024x1024 and a maximum of 2048x2048.  A higher texture resolution could slow down rendering speed.

Trying this out, but I don't see where I can import a grid image to apply. Still trying to figure iut out. Thanks though!

@ TwiztidKidd: I interpreted the OP's query differently from you which leads me to ask: Do we want to display a wireframe version of the object or actually project a custom grid on the object?  

We need further elaboration about what exactly is the purpose of the grid and visual examples on the final application.  

hborre took the words right outta my mouth, help us understand what are you trying to do. We are patient

Wait, I think I get it: you are applying a grid texture, same grid texture to different objects and you wonder why the texture (the squares) appear to be smaller or bigger depending on what object you apply it to... Is that it?

My bad, lemme expand. 

So I use Poser for difficult poses for comics. Foreshortening etc. I don't really care about how its rendered as I change the lighting source anyways, BUT I'm now adding in boxes and resizing them to figure out where the perspective points are. But it would be much easier if the boxes had a grid texture on them so I could follow the lines to the vanishing point. See what I mean? Images attached might help.

The blocks on the side helped me locate the vanishing point and horizon line. It would be much easier if it had a grid texture on it though

Wait, I think I get it: you are applying a grid texture, same grid texture to different objects and you wonder why the texture (the squares) appear to be smaller or bigger depending on what object you apply it to... Is that it?

You could throw a brick texture on those two walls if that helps and gives you guidance. I don't know about Aux Camera, I would use the Main Camera and just re-adjust the Focal Lens. You'll probably want a dramatic lighting in this case too... light coming mostly from above, with contrasted shadows.

LOL! You can disable signatures from being displayed: https://www.renderosity.com/settings/forums

then uncheck "Show other users' signatures?" then click on Save Changes.

There's a feature in this free program called JPEG View that alters the perspective of an image. It's pretty cool, I used it a couple of times, let me show you what it does:

If you're looking for a grid on the 2 blocks to see their perspectives, try adding a tile node. You can find it under 2D textures.

Poser does have a set of guides to help with vanishing points and horizons.  Unfortunately, the guides require a figure to be present in the scene, they don't work with props.  Go to Display at the taskbar and on the pulldown menu, navigate to Guides.  There you will find Horizon Line and Vanishing Lines.  The screencap below shows how the preview will look.

I am using Poser 13 to demonstrate the feature but, as I recall, this has always been built into Poser past versions.

As described by RedPhantom a procedural material like grid rather than a texture map would be easier to manage in this case. IIRC procedural mats can still be impacted by the UV layout but a simple cube should be ok. For more complex shapes and UV layouts using triplaner projection would allow a grid to be projected on to the model that would compensate for uneven UV layout but somekind of texture app would be required to do the projection.