Transparency map not casting the right shadow

[pciccone]

Hi.
I'm in final step of writing an exporter but I'm still struggling with a couple of material issues. Look at the attached image. While the transparency for the hair renders correctly, the shadow projected on the left cheek of the subject is completely solid, there are no strands visible.

The material is defined as a mix with a grayscale jpeg providing the trans map. I have to use this configuration as my exporter takes a pre-existing model and exports it, I have no way of changing the original model and update the textures to support alpha channels. Here is the generated code

Code: Select all

# Material "Hair_33.mat2"
Texture "Hair_33.mat2.Kd" "color" "imagemap" "string filename" ["SFH_LightBrown.jpg"] "string mapping" ["uv"] "string wrap" ["repeat"] "string filtertype" ["bilinear"] "float uscale" [1.0] "float vscale" [-1.0] "float gain" [1] "float gamma" [2.2]
Texture "Hair_33.mat2.Kd.scale" "color" "scale" "texture tex1" ["Hair_33.mat2.Kd"] "color tex2" [1.000 1.000 1.000]
MakeNamedMaterial "Hair_33.mat2" "string type" ["matte"] "texture Kd" ["Hair_33.mat2.Kd.scale"]

# Hair_33.mat1
MakeNamedMaterial "Hair_33.mat1" "string type" ["null"]
Texture "Hair_33.map" "float" "imagemap" "string filename" ["SFH_Trans.jpg"] "string mapping" ["uv"] "string wrap" ["repeat"] "string filtertype" ["bilinear"] "float uscale" [1.0] "float vscale" [-1.0] "float gain" [1] "float gamma" [2.2]
# Hair_33
MakeNamedMaterial "Hair_33" "string type" ["mix"]
"texture amount" ["Hair_33.map"] "string namedmaterial1" ["Hair_33.mat1"] "string namedmaterial2" ["Hair_33.mat2"]


Any suggestion on how to solve this issue will be greatly appreciated.

[jeanphi]

Hi,

Which version and which integrator are you using?

Jeanphi

[pciccone]

I'm using 0.7RC2 and this is what is written by the exporter before the WorldBegin section. I didn't include the LookAt and Camera statements:

Code: Select all

Film "fleximage"
  "integer xresolution" [1024]
  "integer yresolution" [576]
  "integer haltspp" [0]
  "integer halttime" [0]
  "bool premultiplyalpha" ["false"]
  "string tonemapkernel" ["reinhard"]
  "float reinhard_prescale" [1.000000]
  "float reinhard_postscale" [1.200000]
  "float reinhard_burn" [6.000000]
  "integer displayinterval" [12]
  "integer writeinterval" [120]
  "string ldr_clamp_method" ["lum"]
  "bool write_png" ["true"]
  "string write_png_channels" ["RGB"]
  "bool write_png_16bit" ["false"]
  "bool write_png_gamutclamp" ["true"]
  "string filename" ["reality_scene"]
  "bool write_resume_flm" ["false"]
  "bool restart_resume_flm" ["true"]
  "integer reject_warmup" [128]
  "bool debug" ["false"]
  "float colorspace_white" [0.314275 0.329411]
  "float colorspace_red" [0.630000 0.340000]
  "float colorspace_green" [0.310000 0.595000]
  "float colorspace_blue" [0.155000 0.070000]
  "float gamma" [1.800]
PixelFilter "mitchell"
   "float xwidth" [1.500000]
   "float ywidth" [1.500000]
   "float B" [0.333300]
   "float C" [0.333300]
   "bool supersample" ["true"]
Accelerator "tabreckdtree"
  "integer intersectcost" [80]
  "integer traversalcost" [1]
  "float emptybonus" [0.200000]
  "integer maxprims" [1]
  "integer maxdepth" [-1]
Sampler "metropolis"
  "float largemutationprob" [0.400000]


Thanks!

[pciccone]

Hi Jeanphi, you are the man! I forgot that I didn't implement the integrator in my exporter, now it works beautifully. Thank you!

[tomb]

On a side note, that's a nice model & render - may I ask what software the exporter is for?

[patro]

On a side note, that's a nice model & render - may I ask what software the exporter is for?

yeah!!
wich program, exporter... and the model is made with...

[pciccone]

Thank you for the feedback. I can't say anything about the software yet but I will be posting here more information in just a few days, together with more renders.

Cheers.

[tomb]

Thank you for the feedback. I can't say anything about the software yet but I will be posting here more information in just a few days, together with more renders.

Cheers.

Ooh, a mystery! Looking forward to it!

[patro]

hi!!!
we want to know more about the software and the exporter...
is it makehuman? I hope!!
I read it has a blender exporter....

[pciccone]

Hello, I will give more details very soon but I can tell you that it's not Make Human.