Direct answer
glm::scale is a C++ function in GLM (OpenGL Mathematics) for scaling a transformation matrix. It is not the name of a GLM language model or a production model API. The exact spelling and the graphics-math documentation point to the C++ function; they do not support choosing an AI model or configuring an API. (GLM project)
If you meant a language model, the intended provider and model still need to be confirmed. The two meanings should not be combined into one guide.
Using glm::scale
In GLM 0.9.5’s GLM_GTC_matrix_transform documentation, this overload accepts a 4×4 matrix and a three-component scale vector, and returns a 4×4 matrix. That extension’s documented include is <glm/gtc/matrix_transform.hpp>. Check the matching documentation for your installed GLM version if you are using a different release. (GLM 0.9.5 API reference)
#include <glm/gtc/matrix_transform.hpp>
#include <glm/vec3.hpp>
#include <glm/mat4x4.hpp>
int main() {
glm::mat4 model(1.0f); // identity matrix
model = glm::scale(model, glm::vec3(2.0f, 1.0f, 1.0f));
}
Here, the scale vector specifies the x, y, and z factors: (2, 1, 1) doubles the x scale while leaving y and z unchanged. The call returns a transformed matrix, which the example assigns back to model. (GLM 0.9.5 API reference)
For the matrix-and-vector usage shown in the c-jump glm::scale tutorial, the relationship is result = m * S, where m is the input matrix and S is the scale matrix. The tutorial also shows calling glm::scale with a matrix created by glm::translate. This multiplication relationship describes that function usage; it is not, by itself, a general explanation of every transformation-order convention or effect in a graphics pipeline.
Don’t confuse the graphics library with GLM language models
GLM is also used in the names of language models. Those are separate products: for instance, Z.ai’s developer documentation has a page for GLM-5.3 and describes API protocols and endpoints there. That does not make glm::scale an AI-model identifier, nor does it establish that the C++ function has a production API. (Z.ai developer documentation)
For developers searching for the C++ function: use a version-matched GLM reference for signatures, headers, and behavior. For teams seeking AI-model selection: the intended provider and model must first be identified; this keyword alone does not establish a model choice or complete the requested production-API comparison.