Obsidian: [[08-01-01-V_Expressions]] [[10-01-01-V_Syntax]] [[07-01-01-V_Strings]] [[05-01-01-V_Orientation]] [[03-01-01-V_Measure]] [[03-_V_Curves]]
Read Attribute
Create foo attribute with value of:
@foo = v@P[0]; - Fetch ‘x’ position (Can also use .x, .y, and .z [0], [1], and [2] index)
@foo = v@opinput1_P; - Fetch attribute from second input
@foo = point(1, "Cd", @ptnum); - Read point attribute from second input
@foo = prim(0, "string_attribute_name", @primnum); - Read primitive attribute from point wrangle
@foo = details(0, attribute); - Fetch from detail string
@foo = detail("../repeat_begin1_metadata1/","iteration", 0); - Get iteration number
Attribute from Group
i@foo = @group_bar; - Store group ‘bar’ in attribute ‘foo’
i@foo = (@group_bar==1) ? 1:0; - Using if statement
i@foo = inpointgroup(0, "bar", @ptnum); - In Point group
i@foo = invertexgroup(0, "bar", int vertexnum) - In Vertex group
i@foo = inprimgroup(0, string groupname, int primnum) - In Prim group
if (@group_bar==1)
@foo=1;
else
@foo=0;
int ingroup = inpointgroup(0,"bar",@ptnum);
if (ingroup == 1)
@foo=1;
else
@foo=0;
if(inprimgroup(0,"barA", @id) == 1 && inprimgorup(0,"barB", @id)){
@foo=1;
}
else if(inprimgroup(0,"barA", @id)){
@foo=0;
}
Group by Attribute
Partition SOP - Can create groups by rule
if (@P.x>0) i@group_bar = 1; - Add to group by attribute threshold
if (match("*box1", s@objname) == 1) @group_bar = 1; - Add to group if strings match
setpointgroup(0, sprintf("points_%g", (@ptnum + int(rand(@ptnum)) % ch("num_groups") ), @ptnum, 1, "set"); -
Group Operations
Create Group by normal
vector up = set(0,1,0);
vector N = v@N;
float angle = acos( dot(normalize(up), normalize(N)));
angle = angle/(3.14/180);
if(angle<chf("threshold")){
@group_bar = 1;
}
expandpointgroup(int opinput, string groupname)
Casting
Class
(float)foo - Cast to float
float(foo) - Cast to float
vector(foo) - v@foo = dot(v@N,normalize(vector(rand(@ptnum)))) * 0.5 + 0.5;
s@foo = itoa(i@number) - Int > String
f@foo = atof(f@number) - String > Float (0.0 if the string does not contain a number)
i@foo = int(rint(f@float)) - Float > Int
hsctorgb()
rgbtohsv()
rgbtoxyz()
zyztorgb()
serialize ()
unserialize()
Conversion
Cd = Cd.zzy; - Swizzle
Transfer
Detail > Points (point wrangle)
Import detailarray as a local point array.
(If any array element modulo of 2 is equal to zero,
point with the same number is colored.)
int importarray[] = detail(0, 'detailarray');
foreach(int i; importarray)
{
if(i%2 == 0)
{
setpointattrib(0, 'Cd', i, {1,0,0});
}
}
Points > Detail (detail wrangle)
Iterates over the geometry points, reads their positions and puts each value into a detail array
v[]@myarray;
for(int i=0; i<@numpt; i++){
vector item = point(0, 'P', i);
insert(@myarray, 0, item);
}
int npt = npoints(0);
vector importarray[];
resize(importarray, npt);
for(int i = 0; i < npt; i++) {
importarray[i] = point(0, "P", i);
}
(point wrangle)
Export every point to one detail array
int point[] = array(@ptnum);
setdetailattrib(0, "points", point, "append");
Accumulate
f@accusum = 0;
for(int i=0; i<@numpt; i++){
@accusum = @accusum + point(0, 'mattemp', i);
@testloopcount += 1;
}
for(int j=0; j<@numpt; j++){
setpointattrib(0, 'accu', j, @accusum);
}
Collect in detail attrib:
vector p[];
p[0] = v@P;
setdetailattrib(0, "pArray", p, "append");
Attributes
Material:
s@shop_materialpath - Path to a material. You can add this attribute to points using the Material surface node. When you instance an object onto a point with this attribute, the instanced object uses the given material. Not supported in the viewport.
s@material_override A serialized Python dictionary mapping parameter names to values. You can add this attribute to points using the “override” controls on the Material surface node. When you instance an object onto a point with this attribute, the instanced object applies the given overrides to its material.
Time
$F - The current frame, (as set with the play bar controls)
$FSTART - start frame, $FEND - end frame
f@Time - Float time $T - Current time, in seconds
f@Frame - Float frame $FF
f@SimTime - Float simulation time $ST, only present in DOP contexts.
f@SimFrame -Float simulation frame $SF, only present in DOP contexts.
f@TimeInc - Float time step 1/$FPS
General
i@ptnum - Current point number / i@primnum / i@vtxnum
i@numpt - Total number of points / i@numprim / i@numvtx
Geometry
v@P - Point/Primitive Position
v@N - Point/Primitive/Vertex Normal - to initialize normals @N = @N
v@Cd - Color
v@v - Velocity (e.g. for motion blur / in particle systems)
v@pivot - Local pivot point for instance
f@lod - Detail/Primitive Level of detail
v@rest - Rest position
Pop
v@force - Force (e.g. acting on particle)
f@age - Particle Age
f@life - Max. Particle Life
Transform
f@pscale - Uniform scale. Used in copy-SOP or particle systems
v@scale - Non-Uniform scale. For use see pscale
v@up - Up-Vector. Used together with @N to orient point/particle/instance
p@orient - Quaternion defining the rotation of a point/particle/instance
p@rot - Quaternion defining additional rotation
v@trans - Translation of instance
3@transform - Transformation matrix (used e.g. in Copy-SOP)
Volumes
f@density - Density of voxel
i@ix, @iy, @iz - Voxel indices along each axis. Ranging from 0 to resolution-1
v@center - Center of current Volume
v@orig - Bottom left corner of current Volume
v@size - Size of current Volume
v@dPdx - Change in position to get from one voxel to the next in x direction
v@dPdy - Change in position to get from one voxel to the next in y direction
v@dPdz - Change in position to get from one voxel to the next in z direction
v@BB - relative position inside bounding box. Ranging from {0,0,0} to {1,1,1}
Shading
v@Cd - Diffuse Color
f@Alpha - Alpha transparency
v@uv - Point/Vertex UV coordinates
v@Cs - Specular Color
v@Cr - Reflective Color
v@Ct - Transmissive Color
v@Ce - Emissive Color
f@rough - Roughness
f@fresnel - Fresnel coefficient
f@shadow - Shadow intensity
f@sbias - Shadow bias
Intrinsic
- being an extremely important and basic characteristic of a person or thing.