Problem: Blended material to null

[Conz]

Hi,

I'm testing the way to use "alpha maps".
I have blended a white diffuse material with a null material.
The shadow looks good, but the null material is rendered as a gray material.

the code:

Code: Select all

	<material>
		<name>null</name>
		<null_material/>
	</material>

	<material>
		<name>Material.001</name>
		<diffuse>
			<albedo_spectrum>
				<rgb>
					<rgb>0.8 0.8 0.8</rgb>
					<gamma>2.2</gamma>
				</rgb></albedo_spectrum>
		</diffuse>
	</material>


	<material>
		<name>Material</name>
		<blend>
			<a_name>Material.001</a_name>
			<b_name>null</b_name>
			<blend_factor>1</blend_factor>
			<blend_map>
				<path>masktest01.png</path>
				<uv_set>uv</uv_set>
				<exponent>1.000000</exponent>
				<a>0</a>
				<b>1</b>
				<c>0</c>
			</blend_map>
		</blend>
	</material>

tested it with following code, too:

Code: Select all

....
	<material>
		<name>Material</name>
		<blend>
			<a_name>Material.001</a_name>
			<b_name>null</b_name>
			<blend_factor>uv</blend_factor>
			<blend_map>
				<path>masktest01.png</path>
				<uv_set>uv</uv_set>
				<exponent>1.000000</exponent>
				<a>0</a>
				<b>1</b>
				<c>0</c>
			</blend_map>
		</blend>
	</material>

(with "<blend_factor>uv</blend_factor>")

(indigo 1.0.3)

[CTZn]

That may be because bidir is on, AFAIK null material doesn't like that.

[OnoSendai]

Looks alright to me, where's the problem?

[Conz]

Looks alright to me, where's the problem?

EDIT: Null material is not transparent with bidir on. Try your grass tutorial with bidir on.

CTZn was right. The problem was the bidir. (Thanks for your help)
I have rendered it now with Metropolis only and it's looks ok.

Here's the Metropolis render:

[Conz]

Some clear rendering. The diffuse material is now red.

[CTZn]

I spent some time myself checking the image b4 posting, but I did when I identified that the gray region on plane could not be a shadow projection.

That's a known issue Conz,

cheers !

[Conz]

...
That's a known issue Conz,

ok, thank you.

Yes I agree, the first sample picture was not clear enought.

[OnoSendai]

Actually i didn't know about this. So thanks Conz!

[Kram1032]

lol
the bug was known (and fixed) in a different way:
shadows rendered as if there was no alpha, with BiDir.
But yet, the material itself rendered correct (I think)
Now, Ono made the shadows faster (I don't know any more, which release, though... I think, it was one in the 0.9 series)