`plptex3`: Write text inside the viewport of a 3D plot.

 ``` plptex3 ```(x, y, z, dx, dy, dz, sx, sy, sz, just, text);

Writes text at a specified position and inclination and with a specified shear within the viewport. Text is clipped at the viewport boundaries. The reference point of a string lies along a line passing through the string at half the height of a capital letter. The position of the reference point along this line is determined by `just`, and the reference point is placed at world coordinates (`x`, `y`, `z`) within the viewport. The inclination and shear of the string is specified in terms of differences of world coordinates making it easy to write text parallel to a line in a graph.

 `x` (PLFLT, input) x coordinate of reference point of string. `y` (PLFLT, input) y coordinate of reference point of string. `z` (PLFLT, input) z coordinate of reference point of string. `dx` (PLFLT, input) Together with `dy` and ` dz`, this specifies the inclination of the string. The baseline of the string is parallel to a line joining (`x`, `y`, `z`) to (`x`+`dx`, `y`+`dy`, `z`+`dz`). `dy` (PLFLT, input) Together with `dx` and `dz`, this specifies the inclination of the string. `dz` (PLFLT, input) Together with `dx` and `dy`, this specifies the inclination of the string. `sx` (PLFLT, input) Together with `sy` and ` sz`, this specifies the shear of the string. The string is sheared so that the characters are vertically parallel to a line joining (`x`, `y`, `z`) to (`x`+`sx`, `y`+`sy`, `z`+`sz`). If `sx` = `sy` = `sz` = 0.) then the text is not sheared. `sy` (PLFLT, input) Together with `sx` and `sz`, this specifies shear of the string. `sz` (PLFLT, input) Together with `sx` and `sy`, this specifies shear of the string. `just` (PLFLT, input) Specifies the position of the string relative to its reference point. If `just`=0., the reference point is at the left and if `just`=1., it is at the right of the string. Other values of `just` give intermediate justifications. `text` (const char *, input) The string to be written out.

Redacted form: ```plptex3(x, y, z, dx, dy, dz, sx, sy, sz, just, text)```

This function is used in example 28.