Indigo Renderer Forum

zeitmeister wrote:Got it!
First three images ONLY ONE color texture. There are 8 different trees with 8 different alpha leaf blend materials; all accessing the main color changer material.
So this way I got to change/apply/setup the color variation shader ONE TIME, but get 8 different alpha leaf materials out of it.
Last picture using ONLY TWO textures, but color and gamma variation applied.

trees1.jpg

trees2.jpg

trees3.jpg

screenshot_shader.jpg

Code: Select all

def eval(vec3 pos) vec3 :
	let

		NUM_TEXTURES = 2
		tex_index = floorToInt(gridNoise(real(objectId())) * NUM_TEXTURES)

		c = sample2DTextureVec3(tex_index, getTexCoords(0))
		id = real(objectId())

		gamma_var = paramGammaRandomAmount()
		shift_gamma = max(0.0, (1 - gamma_var) + gridNoise(id) * gamma_var * 2.0)

		colour_var = paramColorVariationAmount()
		colour_shift = (vec3(-0.5) + vec3(gridNoise(id), gridNoise(id + 34534), gridNoise(id + 9876465))) * (colour_var * 2.0)

	in
		vec3(pow(c.x, shift_gamma), pow(c.y, shift_gamma), pow(c.z, shift_gamma)) + colour_shift

trees4.jpg

leaf_color_variation.igm

zeitmeister wrote:Thank you a lot!
The only knickknack is the fact that setting up the shader is not possible in the C4D exporter.
fused may have to invest work here, so that the C4D Indigo shader window offers the same possibilities as the Indigo standalone GUI shader window. Plus working and exporting things correctly.

BTW: Ono, does that shader "flicker" or sample everything new when rendering an animation?
And if yes, how can we interdict that?

zeitmeister wrote: BTW: Ono, does that shader "flicker" or sample everything new when rendering an animation?
And if yes, how can we interdict that?

OnoSendai wrote: The randomness is based on the object id which should stay the same frame to frame, so there shouldn't be flickering. Let me know if there is!

pixie wrote:Can't you use the 'export' material?

fused wrote:

zeitmeister wrote:Yikes... awesome!
Then please tell Yves how you did that!
This should be a feature implemented in every available exporter!

I once did color variation in instances for cindigo, but scrapped it

can be done, easily

zeitmeister wrote:

pixie wrote:Can't you use the 'export' material?

Of course, but then I can change everything, all textures and parameters, only in Indigo standalone GUI... and that's not what we want.
We want full ISL-shader-access in the exporters.

zeitmeister wrote:Got it!
First three images ONLY ONE color texture. There are 8 different trees with 8 different alpha leaf blend materials; all accessing the main color changer material.
So this way I got to change/apply/setup the color variation shader ONE TIME, but get 8 different alpha leaf materials out of it.
Last picture using ONLY TWO textures, but color and gamma variation applied.

A problem occurred with the scene:
Failed to find function 'l1l1llll1lll11l1111111l111ll1l1ll(FullHitInfo, vec4, vec4)'.
ShaderSpectrumMatParameter user shader code, line 7:
	ll1llll1llllll1l11l1l1l11l111llll = ll1111ll11llll111l1l11111ll1l1l1l((gridNoise(lll1111ll11lll1111ll11l11l1l1ll11(l1
l1llll1lll11l1111111l111ll1l1ll(l111ll1lll11ll1lll1lllllll1l1ll11, l1l111l1l11lllll1111lll11l11l1ll1, l1ll11111l111l1111lllll111l11lll1))) * l1ll11l1ll11l1llll11lllll11l1l1ll))