WebGL: Add support for setting initial position and location.

[msbaines]

Motivation and Context

This is required for reproducibility.

How Has This Been Tested

Verified that agent is now always in the same location at start.

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have completed my CLA (see CONTRIBUTING)
• I have added tests to cover my changes.
• All new and existing tests passed.

[angelxuanchang]

This is useful functionality and the changes looks pretty good. My one suggestion would be to rename the this.state in simenv_embind.js to this.initialAgentState (to make it clear that is it agent state and that is used in reset). Other comment is that we need to start to have more documentation - in this case, specify what happens with unspecified parameters in the agent state (such as velocity, force, etc - I believe they are all set to 0).

[msbaines]

This is useful functionality and the changes looks pretty good. My one suggestion would be to rename the this.state in simenv_embind.js to this.initialAgentState (to make it clear that is it agent state and that is used in reset). Other comment is that we need to start to have more documentation - in this case, specify what happens with unspecified parameters in the agent state (such as velocity, force, etc - I believe they are all set to 0).

Yes, initialAgentState is much clear. Will add documentation in a separate change. I am thinking of using JSDoc annotations and documentationjs for the documentation generation.

[msavva]

LGTM. 👍