Example: Default Color and Multiplier Values

Here is a scene rendered with the default VRayLightMtl. These examples demonstrate how the material behaves in V-Ray, and how its parameters influence the look of the final results.

The white plane is a default VRayLightMtl. The teapot is a default VRayMtl with Reflection. The rest is just VRayMtl with diffuse colors.

We are going to render this scene with Default Lights turned off until the end of the example, and no lights will be used in it either.

Default Lights - Off.
Multiplier: 1.0
No GI, No lights

As you see, the image is absolutely dark except the plane (self-illuminated) and the reflection on the teapot. Notice we have no GI and no lights at all here, so the dark part of the scene is to be expected.

Multiplier: 50.0
No GI, No lights

Notice that nothing changed in general, BUT the reflection on the teapot got stronger due to higher multiplier. The rest is still black because we still have the GI off.

Multiplier: 1.0
GI: on

As you can see, turning GI on almost didn't change the overall look. That is because of the Multiplier value: 1.0. It acts mainly to self-illuminate the object that has the VRayLightMtl.

Multiplier: 5.0
GI: on
2-sided: off

Now you can see that increasing the Multiplier has visibly influenced the scene (shadows also appears).

Multiplier: 5.0
GI: on
2-sided: on

Scene starting to gather more light because 2-sided is on.

Multiplier: 10.0
GI: on
2-sided: off

As you can see, the back is still dark, but you can already notice the blue wall receiving some GI, due to a higher Multiplier. Shadows also appears more defined.

Multiplier: 10.0
GI: on
2-sided: on

The scene starts to gather more light because 2-sided is on, but we also start to get some burnt areas due to Linear type of Color mapping

Multiplier: 30.0
GI: on - default
2-sided: off
Exponential

So, increasing the Multiplier affects the GI more (we have more light), but you can also see that our render is quite splotchy.

Multiplier: 30.0
GI: on - default
2-sided: on
Exponential

Scene starting to gather more light because 2-sided is on. Still splotchy GI solution.

Multiplier: 30.0
GI: on; 2-sided: off
IR: HSphS: 100
IR: Interp.S: 40

Comparing this result to the previous, the new render looks much better. The GI solution is clearer, and shadows are more precise. Of course, this leads to higher render time.

Multiplier: 30.0
GI: on; 2-sided: on
IR: HSphS: 100
IR: Interp.S: 40

Comparing this result to the previous, the new render looks much better. GI solution is clearer, and shadows are more precise. Of course, this leads to higher render time.

Example: Texmap

This example shows how the Texmap slot is used and how the map determines the Color parameter.

Multiplier: 3.0
GI: on; 2-sided: on
IR: HSphS: 100
IR: Interp.S: 40
Exponential

Here, we used a Bitmap in the Texmap slot. The Multiplier is quite low, so only the plane and the reflection on the teapot are visible.

Multiplier: 30.0
GI: on; 2-sided: on
IR: HSphS: 100
IR: Interp.S: 40
Exponential

Increasing the Multiplier leads to a much brighter look in the scene. Notice now that the Bitmap is getting closer to appearing white, due to multiplying the (R,G,B) values of the Bitmap.

Multiplier: 3.0
GI: on; 2-sided: on
IR: HSphS: 100
IR: Interp.S: 40
Exponential

Here, another Bitmap is assigned to the Texmap slot. Notice that we haven't changed the VRayMtls for the surrounding walls, but the scene looks different from the previous one due to the new Bitmap.

Multiplier: 30.0
GI: on; 2-sided: on
IR: HSphS: 100
IR: Interp.S: 40
Exponential

Increasing the Multiplier leads to a much brighter look in the scene. Notice now the Bitmap is getting closer to appearing white, due to multiplying the (R,G,B) values of the Bitmap.