How to make the color and shape look the same

[Bill_L]

Hi, everyone, I am trying to use the software to create a set of pictures for my visual search experiment. I want the distractors to have the same shape but different color or have the same color but different shape as the target.

For the shape, I don't need the same shape/different color to be exactly the same shape, I only need it to look the same size as the target.

But due to the distance and lighting, I can't have the same shape or same color unless I use my owe eye to adjust it.

I attach a picture to illustrate, the tablet in the red rectangular is the target and the two frames in the black are the distractors.

Any suggestions about how I canget the same shape/color in a more systematic way, so I don't have to writhe "use my own eye" in my paper? Thanks in advance.

[Puybaret]

If you don’t want that the lights of the scene alters the color of an object, you could use a 3D model at OBJ format with an associated MTL file containing materials with an [font=courier new]illum 0[/font] setting. See this thread for some examples (even if that thread is about how to make glowing lights with ray tracing renderers).

[Puybaret]

And about the fixed shapes, it’s not possible to avoid the resizing / deforming / hiding effect of the perspective projection.
Using OBJ spheres with an [font=courier new]illum 0[/font] setting could avoid the deforming effect (you would get a disc with a fixed color) but it still could be more or less large at screen according to its distance to the camera and possibly hidden by other objects in front of it.

[Bill_L]

Thank you. I will try to use the .obj format