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1. #Renderman water shader how to#
2. #Renderman water shader archive#
3. #Renderman water shader pro#
4. #Renderman water shader software#

Scale 1 1 -1 # ? LightSource "basic_distant" "RenderManLight2"

#Renderman water shader pro#

RenderMan for Maya Pro (RenderMan Studio).Īttribute "identifier" "string name" For example, the snippet shown below is from a rib file generated by Into the rib stream, a negative scaling on the z-axis immediately prior to instancing the

#Renderman water shader software#

Listing 2 but not when used in Maya or Houdini?įor reasons known only to the software engineers at Pixar and Side Effects their products insert, Upward! So why does the shader behave correctly when tested with the rib file shown in Using RenderMan Studio, or in Houdini they will see the illumination is reversed - aĭownward facing light will illuminate the scene as if it were pointing If the reader assigns the shader from listing 3 to a directional light source in Maya, (figure 4) indicates the illumination is coming from the camera. In particular, note the specular hilite on the sphere Illumination of the scene remains constant. Notice that no matter what valuesĪre specified for the Rotate and Translate statements in the Rib file the The shader should be re-compiled and the scene re-rendered. Vector direction = vector " camera " (0,0, 1)

"shader" coordinate system will the light "respond" to the transformations intended to orientate it.Īs an experiment, the reader should reset the direction to, Consequently, only by defining the direction vector within the The direction vector, in effect, "parents" the light to the coordinate system that was createdĪnd subsequently transformed by the Rotate and Translate commands that The "shader" coordinate system is identical to the coordinate system that was active when So, what is "shader" space and why has it been used? In other words, the xyz values would be distances meaasured from the origin of the camera. It would would have been, by default, defined in the camera coordinate system ie. However, had the vector been declared as, Vector direction = vector " shader " (0,0,-1) Pre-defined coordinate system named "shader" ie. Note that in listings 1 & 2 the direction variable has been assigned xyz values in a Translate 0 1 0 Rotate -90 1 0 0 LightSource "basic_distant" 2 "intensity" 1 TransformEnd Provide the rib "equivalent" of the transformations shown in figure 3. The rib file, basic_distant.rib, should be edited so that two transformations Vector direction = vector " shader "(0, 0, -1) "from" and "to" parameters have been removed and it's direction has been "hard wired" A modified version of the basic_distant shader is shown below. In the case of Maya, the light's transform node (figure 3) enable its orientation toīe adjusted. For example, the defaultĭirection of a Maya "directional" light is shown in figure 2. The assumption they "face" toward negative Z. That enable it's direction to be adjusted. The first thing to note about the basic_distant shader is that it has two parameters LightSource "basic_distant" 2 "intensity" 1 archives:Cutter_Help/templates/Rib" Display "distant_test" "framebuffer" "rgba" Format 400 250 1 textures" Option "searchpath" "archive" ".

shaders" Option "searchpath" "texture" ".

#Renderman water shader archive#

They store their custom shaders, textures and archive (pre-baked) rib files. The reader should ensure the paths shown in red "point" to the directories in which It is an example of a light source intended to mimic sunlight.Ī rib file that implements a simple scene (figure 1) that can be used to test the shader Listing 1 shows a slightly modified version of Pixar's classic "distantlight" shader. " RfM:Using Custom Light Source Shaders".

#Renderman water shader how to#

Quickly access the source code of the shaders that ship with differentįor a brief description of how to use a custom light shader with RenderMan Studio Shader Source Facility", should be reviewed because it explains how Cutter can It explains how to configure Cutter for shader writing. " Cutter Setup: RenderMan Shader Writing". The tutorial,īefore continuing the reader should refer to the tutorial Some of the shaders presented hereĭemonstrate how data can be passed to custom surface shaders for the purpose of This tutorial focuses on some of the issues relating to the writing of directional light source shaders ie.